Crom Bás

For the quests to gain access to this page's contents, see Waves Amidst the Calm.

Mission Information Time Limit None Party Count 1~4 Quest Board Location Brielle Minimum Level None Minimum Total Level None Minimum Combat Skill Level 1,500

“	On that dark and stormy night, what exactly did we see…?	„

Description

• Crom Bás is an incredibly difficult maze-like castle in Tory Ravine that offers high-level rewards to those who can clear its challenges.

Requirements

• Requires a Total Combat Skill Level of 1,500+ and for Waves Amidst the Calm to be cleared.
• If the player finds Normal, Advanced, or Elite Crom Bás too difficult to clear for the purposes of the questline they can instead complete Crom Bás Quest Mode.
  • Crom Bás Quest Mode is far easier than regular Crom Bás and revivals are automatic. Gold is the only reward, however.

Limitations

• You cannot use certain revival methods.
  • Nao Stones, Guardian Soul Stones, Advanced Feathers, and Balloons are prohibited.
  • Regular Phoenix Feathers, Party Feathers, Pet First-Aid Kits, Defiance, and the Flame of Resurrection are allowed.
• You cannot use certain skills.
  • Barrier Spikes and Campfires are prohibited.
• You and your party can only rejoin Crom Bás after logging out, crashing, or closing the game 3 times for each party member.
• You will be afflicted with Potion Indigestion; all Potions will have a 30-second cooldown after use.
• Crom Bás can only be cleared 10 times a week.
  • A failed attempt will not count towards the limit.
  • Clear count is reset at EST: 10:00am
    UTC: 3:00pm
    AEDT: 2:00am
    7:00am PST100 on Saturday.
  • Clearing it afterwards will only reward 1 Adamantine Coin for Normal, 2 Adamantine Coins for Advanced, and 4 Adamantine Coins for Elite.
  • Having a Crom Bas Reward Key Coupon will ignore the above limitations once per Coupon.

Dynamic Difficulty

• The difficulty of Crom Bás changes while players are inside of the castle based on player action/inaction. There are three measures of difficulty:

Dark Erg

• Dark Erg, shown in Red, is the overall difficulty of the dungeon and its mobs. Increasing this will also increase the possible rewards from Crom Bás.
  • Increasing the Dark Erg Gauge is optional. It will make Crom Bás more difficult but the rewards will be greater.
  • Dark Erg 0~30% is considered Normal difficulty, Dark Erg 40~70% is considered Advanced difficulty, and Dark Erg 80~100% is considered Elite difficulty.
  • When raising the Dark Erg into the next difficulty tier, the screen will go red and Glas Ghaibhleann will roar; this indicates that some monsters have been replaced with their Dark variant.
• Dark Erg starts at 20% when players enter Crom Bás.
• Dark Erg is controlled by the Teleportation Ritual Circles.
  • Traveling through a Red Circle will increase the Gauge by a flat +10%, up to 100%.
  • Traveling through a Green Circle will decrease the Gauge by a flat -10%, down to 0%.
  • Traveling through a Yellow Circle will maintain the Gauge at its current percentage.
• The Teleportation Ritual Circles that are offered are preset depending on the path that the party takes through Crom Bás, and some Circles will only appear if the party successfully accomplishes a room's goal.

Pursuers

• Pursuers, shown in Blue, is the measurement showing the likeliness of being ambushed by a swarm of enemies.
  • Increasing the Pursuers Gauge is never recommended on Normal Difficulty. It will only make Crom Bás more difficult for no greater reward.
  • In the Final Battle Room on Advanced and Elite Difficulties, higher Pursuers Gauge will reduce the number of waves.
• Pursuers will generally increase when the party fails to perform certain actions. These include:
  • A player hitting an Alarm Bell will increase the Gauge by +5%.
  • An Un Llygadog hitting an Alarm Bell will increase the Gauge by +20%.
  • Farming in the Note Puzzle room will increase the Gauge by +7% each wave after the second (for a total of +49%).
• The Pursuers Gauge will only decrease when Pursuers are spawned, decreasing by -10% when this happens.
  • This does not occur if an Alarm Bell has rung.

Crom Bás Info

• Crom Bás Info, shown in Green, is the measurement showing how much optional work the players have done to remove traps and boost their character's abilities in the castle.
  • Increasing the Crom Bás Info Gauge is usually recommended. It will make Crom Bás less difficult for no penalty to rewards, though the tasks required to gain Info may be too difficult or lengthy for some players.
• Crom Bás Info will generally increase when the party succeeds to perform certain actions. These include:
  • Farming in the Note Puzzle room will increase the Gauge by +3% each wave, up to nine times (a total of +27%).
  • Correctly guessing Note Puzzle room's code will increase the Gauge by +10%.
  • Resting by the mysterious Campfires for 1 minute will increase the Gauge by +5% for each party member that does so (a possible total of +20%).
    • Doing so also awards Great Mood status for 5 minutes.
  • Protecting the Civilians until they escape will increase the Gauge by +20%.
  • Guiding the Possession Ghost all the way through without? being hit will increase the Gauge by +20%.
• Upon entering certain rooms, the value of this Gauge determines if a Trap successfully goes off.
  • A Trap will go off if Info does not meet a specific threshold for each room.
  • If the Trap successfully goes off Potion Indigestion is upgraded to Food and Potion Prohibition, preventing the use of all foods and potions for that room. In addition, most colors on the computer screen will become desaturated.
• The value of this Gauge determines the number of helpful buff-offering Souls that appear, from 2 Souls at 0% Info up to 6 Souls at 100% Info.
  • If Souls appear at the completion of room, those Souls will offer 2 buffs to players.
    • Any one player may take a buff from any one Soul, but only one buff per soul is given.
    • Buffs of different kinds cannot stack; however, the same buff can stack.
    • Buffs lose one stack upon death and will expire if all stacks are lost.
  • The first buff offered is a Percent Damage increase to a specific Talent of damaging skills.
    • Damage is increased by +6% for the first buff stack and +1% for each additional stack thereafter.
  • The second buff offered can be a buff to Health Points, Mana Points, Defense, Protection, the Music Talent, or the Holy Arts Talent.
    • Health and Mana is increased by +1000 for the first buff stack and +500 for each additional stack thereafter.
    • Defense is increased by +10 for the first buff stack and +5 for each additional stack thereafter.
    • Protection is increased by +6 for the first buff stack and +3 for each additional stack thereafter.
    • The Music Talent buff decreases Encore's cooldown by -40% for the first buff stack and -10% for each additional stack thereafter.
    • The Holy Arts Talent buff increases the effects of Healing by +100% for the first buff stack and +50% for each additional stack thereafter.

Room Types

Large Room

• The most basic room found in Crom Bás, featuring a large square-shaped room.
  • Every corner will have its own Alarm Bell that either the players or the Un Llygadogs can hit to cause Pursuers to Ambush.
• Two to six waves of enemies will spawn and then the room will be cleared.
• Rooms 1 and 8 will always be Large Rooms.
• Rooms 3, 5, and 6 can be Large Rooms depending on the path taken.

Small Room

• The second-most basic room found in Crom Bás, featuring a small square-shaped room.
  • Every corner will have its own Alarm Bell that either the players or the Un Llygadogs can hit to cause Pursuers to Ambush.
• Two waves of enemies will spawn and then the room will be cleared.
• Rooms 3, 5, and 6 can be Small Rooms depending on the path taken.

Note Room

cromBasOutputAddAdd:cromBasInputNumberOne+cromBasInputNumberTwo+cromBasInputNumberThree cromBasOutputSubSub:cromBasInputNumberOne-cromBasInputNumberTwo-cromBasInputNumberThree cromBasOutputMultMult:cromBasInputNumberOne*cromBasInputNumberTwo*cromBasInputNumberThree cromBasOutputAddSub:cromBasInputNumberOne+cromBasInputNumberTwo-cromBasInputNumberThree cromBasOutputSubAdd:cromBasInputNumberOne-cromBasInputNumberTwo+cromBasInputNumberThree cromBasOutputMultAdd:cromBasInputNumberOne*cromBasInputNumberTwo+cromBasInputNumberThree cromBasOutputMultSub:cromBasInputNumberOne*cromBasInputNumberTwo-cromBasInputNumberThree

📝 Crom Bás Calculator For an Extended Calculator, see Here
1st Number		2nd Number		3rd Number
name=cromBasInputNumberOne;default=0;;		name=cromBasInputNumberTwo;default=0;;		name=cromBasInputNumberThree;default=0;;
Possible Math Solutions
formula=cromBasOutputAddAdd;		formula=cromBasOutputSubSub;		formula=cromBasOutputMultMult;
formula=cromBasOutputAddSub;		formula=cromBasOutputSubAdd;	formula=cromBasOutputMultAdd;	formula=cromBasOutputMultSub;
Possible Keywords
Bas	Baltane	Lughnasadh	Samhain	Imbolic

• The Note Puzzle Room is similar to the more common Small Room, but features a single skull-shaped Switch Orb in the center of the room.
  • Unlike Small Rooms, the Note Puzzle Room does not have Alarm Bells in the corners.
• Two waves of enemies will spawn and then the room will be cleared.
  • Players can press the skull-shaped Switch Orb to summon additional waves of enemies.
    • Clearing these waves will award Crom Bás Info and will reward Notes to the Party Leader.
    • Summoning waves after the second will increase the Pursuers Gauge.
• The Note Puzzle Room hides a Red Teleportation Ritual Circle that can only be accessed by typing aloud a secret phrase.
  • The phrase can be learned from the reward Notes.
  • The 1st reward note is always useless.
  • The 2nd-4th reward notes feature a bulleted number, i.e. "1) 42", "2) 11", "3) 10".
  • The 5th reward note features a mathematical equation to use with the numbers, i.e. "1+2-3"; using the above numbers the result is 42+11-10=43.
  • The 6th reward note features a keyword, i.e. "Last Baltane"
  • The solution is to type into chat the resulting number and the keyword together with no spaces; using the above the solution would be 43Baltane.
  • Reward notes beyond the 6th will hint at how to solve the solution. The 9th and last reward note will simply have the final solution written out verbatim.
  • It is possible to solve figure out all possible secret phrases by the 4th note.
• Room 2 will always be the only Note Puzzle Room.

Defense Room

• The Defense Room features Civilians that must be protected in a similar manner to Revived Illusion or Avalon Bridge.
  • The Defense Room does not have Alarm Bells in the corners.
• Sixteen Waves of enemies need to be defeated and then the room will be cleared.
  • Enemies cannot be allowed to reach the Civilian circle or else the three Civilians will slowly be kidnapped.
  • The room fails if all of the Civilians are captured; this is faster than attempting to clear the room but no benefit will be earned.
• A ritual circle will occasionally form where the enemies spawn in and massively buff the speed and stats of the enemies.
  • In order to deactivate the buff, players will need to hit 3 of the 6 skull-shaped Switch Orbs that surround the Civilians.
  • The pattern required will be the same as the illuminated skull-shaped Switch Orbs that surround the enemies' ritual circle.
• The Defense Room hides a Red Teleportation Ritual Circle that can only be accessed by saving the Civilians.
• Room 4 will always be the only Defense Room.

Possession Room

• The Possession Room features a Spirit that a player must allow to possess them.
  • The Possession Room does not have Alarm Bells in the corners.
• While a player is Possessed, they will be forced to walk at a slow pace without the use of pets or skills.
  • The possessed player must walk from the 1st Possession Circle to the 2nd Possession Circle, and then from the 2nd Possession Circle to the 3rd Possession Circle to clear the task.
  • Getting hit by any attack will cancel the possession and force the players to start over.
  • Elves can use Hide beforehand to completely ignore aggro, making them the best at performing this task.
  • Possession quickly consumes a players Mana and Stamina, possibly leaving them defenseless after this task.
• Enemies in this room will take a Damage-over-Time while they stand inside of the dark fog that lingers where the Possession Circles are placed.
  • They are immune to all other forms of damage, though the fog can quickly defeat them.
    • Enemies will take damage from Meteor Strike however.
  • Spinning Slasher is useful to draw the enemies into the dark fog.
• The Possession Room hides a Red Teleportation Ritual Circle that can only be accessed by escorting the Spirit.
• Room 7 will always be the only Possession Room.

Final Battle Room

• The Final Battle Room is similar to the more common Large Room, but only appears when Irusan is fought at Dark Erg 40% or above.
  • The Final Battle Room does not have Alarm Bells in the corners and it cannot have Pursuers spawn.
• An initial wave of enemies will start spawned in the room, similar to other Large Rooms.
  • Warning: Waves will continuously spawn every 1 minute? inside this room even if the previous wave remains.
• After the initial wave four to seven waves of enemies will spawn, depending on the Dark Erg and on the Pursuers Gauge, and then the room will be cleared when every enemy is defeated.
  • At Dark Erg 40%+, five waves will spawn.
  • At Dark Erg 70%+, seven waves will spawn.
  • Every 15% Pursuers Gauge will reduce the total waves by 1, down to a minimum of 4.
• Room 10 will always be the only Final Battle Room.

Monsters

• Regular Spawns
  • Wraith (Crom Bás)
  • Disciple
  • Gwallgof
  • Ronaun
  • Frozen Cari
  • Slime Wyneb
  • Un Llygadog
  • Merch Diafol
• Dark Regular Spawns
  • Dark Disciple
  • Dark Gwallgof
  • Dark Ronaun
  • Dark Cari
  • Dark Wyneb
• Special Regular Spawns
  • Giant Leprechaun (Crom Bás)
• Boss 0%-30% Dark Erg
  • Irusan
• Miniboss 40%-100% Dark Erg
  • Irusan
• Boss 40%-70% Dark Erg
  • Completed Glas Ghaibhleann
• Boss 80%-100% Dark Erg
  • Giga Glas Ghaibhleann

Tips

Slime Wyneb

Tips for Slime Wynebs

• Slime Wynebs normally explode, but this can be entirely prevented with the Dazed Status Effect (i.e. Smash, Somersault Kick, Chain Crush).
• Slime Wynebs' AI can also become confused because of skills that mess with aggro, such as Raincasting or certain On-Summon Pet skills.
  • In this case, the Slime Wynebs may have additional defenses and it may be better to try to fix their aggro or wait for the aggro to fix itself.

Frozen Cari

Tips for Frozen Caris

• Frozen Caris have a signature ability, Divine Blessing, that forms a frozen circle around them 1 second after spawning in. All allied monsters in the circle receive immensely increased Defense, Protection, Magic Defense, and Magic Protection.
  • Divine Blessing appears to stack, so the Party should prioritize separating Cari.
    • As of May Quality of Life Update (applied 09May2024), Divine Blessing no longer stack between Caris, making them much easier to dispatch.
    • Regardless of the number of Divine Blessings being applied, monsters can still be weakened with Brionac or Seal: Pragarah to no limit.
  • If Spinning Slasher is used on a Frozen Cari before it casts Divine Blessing, the Blessing does not spawn. the Dark Diviner spell Hexshroud may also be used to interrupt Divine Blessing casts. However Dark Caris can and usually do re-cast Divine Blessing after the initial interruption.
    • Rooms that have Frozen Cari as an initial spawn need to be started immediately in order to even attempt this tactic on the Cari.
  • Frozen Cari are immune to Frozen Blast unlike most mobs in Crom Bás.
    • A common strategy is to Death Mark all of the mobs together, use Enhanced Frozen Blast, and then separate the Caris from the rest of the monsters with Wind Blast or Stampede.

Merch Diafol

Tips for Merch Diafol

• Merch Diafol will spawn about 10 seconds after the start of a Large or Small room.
  • There is a chance Merch Diafol will not spawn in rooms even if she is able to.
  • Merch Diafol in subsequent Large and Small Rooms will be stronger if she was not defeated.
  • Merch Diafol will always spawn 10 seconds after a room is started, but she will stay around slightly longer in subsequent rooms.
    • Merch Diafol will not appear until Irusan's Boss Room once she is defeated.
  • Inversely, the Merch Diafol that spawns in Irusan's Boss Room will be significantly weaker if she is allowed to spawn throughout Crom Bás.
    • Merch Diafol will not respawn once defeated in Irusan's Boss Room; because she can make the fight more difficult it is recommend to defeat her.
    • It is up to the Party to decide to deal with Merch Diafol throughout Crom Bás in order to weaken her at the Boss Fight or to defeat her as soon as possible and deal with an enhanced version of her later.
    • Alternatively, the Merch Diafol in Irusan's Boss Room can be weakened with Brionac or Seal: Pragarah to no limit.

Irusan

Tips for Irusan

• Irusan can attack immediately, so its recommended to skip the cutscene.
• Irusan's Normal Attack and Smash can deal considerable damage.
  • Irusan will walk up to players that he intends to use these skills on.
• Irusan has access to Chain Cast Ice Spear, Thunder, and Fireball.
• Damage dealt to Irusan will be buffered, which prevents players from dealing large amounts of damage all at once.
  • This effectively forces the party's damage to stop at each 5% of Irusan's total health.
  • When Irusan is weakened following a successful Percent Health Minigame this effect is not in place, allowing players to deal massive damage.
    • It is possible to skip some Percent Health Minigames if the party deals enough damage when Irusan is vulnerable.
      • Be warned that Irusan will not skip any Nightmare Minigames unless Irusan is killed, instead causing each Nightmare Minigame to queue up and happen back-to-back.
• It is recommended to kill Merch Diafol and to keep all of the Frozen Caris and Slime Wynebs under a Raincasting Rain Cloud.
  • Using something like Shield of Trust to grant Knockdown Immunity before using Raincasting will significantly decrease the chance of Raincasting being canceled.
  • The Frozen Caris and Slime Wynebs have an AI similar to Alban Knights Training Grounds; players may need to use Crisis Escape for Raincasting to work.
  • Dark variants are immune to Raincasting.
    • Between Dark Erg 0~30% Dark variants can be killed and non-Dark variants will spawn instead.
    • When the Dark Erg is at 40%+ some number of Dark variants will always be present.
      • It is possible to trap these Dark variants in one corner by standing across from them in the nearby foyer.
      • It is recommended to kill Dark Caris to try to spawn them in as extra Dark Wynebs instead due to their different AI and slower speed.

Irusan Special Attacks

• Irusan has three main special attacks: Sharpened Claw, Dark Lure, and Devil's Ray.
  • During Irusan's Sharpened Claw attack, Irusan will approach or teleport to a Party member and claw swipe at them.
    • This attack is not particularly dangerous by itself, but getting hit will apply Irusan's Deathly Brand.
  • During Irusan's Dark Lure attack, red circles will appear underneath all Party members and their Pets. When the inner circle reaches the outer circle, the lure goes off.
    • Getting hit by this attack once will reduce HP, MP, and SP to 1, lose 7 dorcha, and will apply Irusan's Deathly Brand. This attack will likely kill players outright if multiple lures are stacked on top of each other.
    • Because Pets increase the number of Dark Lures, it is recommend to avoid leaving Pets out.
      • This can easily cause two Lures to spawn under a player and this will instantly cause death if both land.
    • Skills and abilities that increase healing help greatly against this attack. The Ground-Targeted Healing Glyphs, Fantastic Chorus with the Troubadour's Set's Wig and Hat, and the Purifying Wave skill of Whale Pets are all highly effective.
  • During Irusan's Devil's Ray attack, Irusan will charge and fire a laser ray across the entire boss room.
    • This attack is not particularly dangerous by itself, but getting hit will apply Irusan's Enervating Brand.

Irusan Percent Health Minigames

Irusan %Health Minigames
90%	Cauldron Minigame
75%	Nightmare Minigame
65%	Cauldron Minigame
50%	Nightmare Minigame
25%	Nightmare Minigame
15%	Cauldron Minigame

• At 90%, 65%, and 15% HP Irusan will begin a Cauldron Minigame where the goal is for one player to channel for 10 seconds at Irusan's Cauldron.
  • During this period of time Irusan's Dark Lure attack will not spawn.
  • The Cauldron Minigame lasts 30 seconds.
  • If the party succeeds Irusan will be temporarily unable to do anything.
  • If the party fails Irusan will apply the Snacktastic Brand on all players.
• At 75%, 50%, and 25% HP Irusan will begin a Nightmare Minigame where players must first use the Left and Right arrow keys to break free of the Binding Brand and then attack Irusan a set number of times.
  • During this period of time Irusan's Dark Lure attack will not spawn but existing Lures will still go off.
    • It is highly recommended that the Party triggers this Minigame while a Dark Lure attack is currently happening but after everyone moves from their Dark Lures.
  • The number of times the Party must attack Irusan scales with player count; 60 times for a 1-Person Party versus 340 times for a 4-Person Party.
    • It is recommended that players use Dual Guns alongside Partners equipped with Rag Dolls to pass this phase.
    • If the player does not have a Partner equipped with a Rag Doll, they might alternatively use Monster Mercenary Scrolls and fast attacking Pets.
  • If the party succeeds Irusan will be temporarily unable to do anything.
  • If the party fails Irusan will kill all surviving players and heal.
    • A Phoenix Pet's Flame of Resurrection, the Defiance Technique, a Whale Pet's (such as the Bareback Whale) Defiance, or Logging Out are some ways to avoid this Party wipe. Irusan will still heal, however.

Irusan Brand Status Effects

• Irusan's Deathly Brand is applied by Irusan's Sharpened Claw attack and Irusan's Dark Lure attack.
  • Players with this brand will instantly die to the next Sharpened Claw and Dark Lure attack.
  • Using Rank 1 First Aid will remove this Brand; this option is removed when the Dark Erg is at 80%+.
• Irusan's Enervating Brand is applied by Irusan's Devil's Ray attack.
  • This brand prevents the use of Skills and the consumption of Potions. It also forces the player into a walk.
• Irusan's Snacktastic Brand is applied when Irusan hits 90%, 65%, and 15% HP and the Party fails the Cauldron Minigame.
  • This brand forcibly transforms all Party members into a weak transformation that is only capable of using one specific skill for 20 seconds.
• Irusan's Binding Brand is applied when Irusan hits 75%, 50%, and 25% HP.
  • This brand prevents the use of Skills and the consumption of Potions. It also locks the player in place and damages the player over time.
  • This effect ends if the player succeeds the first part of the Nightmare Minigame.

Glas Ghaibhleann

Tips for Glas Ghaibhleann

• Damage dealt to both versions of Glas Ghaibhleann will be buffered, which prevents players from dealing large amounts of damage all at once.
  • This effectively forces the party's damage to stop at each 5% of Glas Ghaibhleann's total health.
  • When Glas Ghaibhleann is weakened this effect is not??? in place, allowing players to deal massive damage.
    • It is possible to skip some Percent Health Minigames if the party deals enough damage when Glas Ghaibhleann is vulnerable.
      • Monster Summons will occur as normal, as they are not Minigames.
      • Be warned that Glas Ghaibhleann will not skip any Disciple Minigames unless Glas Ghaibhleann is killed, instead causing each Disciple Minigame to queue up and happen back-to-back.
• Glas Ghaibhleann is resistant to Magnum Shot, reducing damage by -20%?.
• Dark Shriekers will occasionally spawn from the edges of the room and move around in patterns.
  • Dark Shriekers will explode if they get near a player or after 10~20? seconds.
  • Dark Shriekers' Self-Destruct can be silenced with Skills such as Chain Crush.
  • If 10? cumulative Dark Shriekers' Self-Destruct hit Glas Ghaibhleann, Glas Ghaibhleann will be temporarily unable to do anything.

Glas Ghaibhleann Special Attacks

• Glas Ghaibhleann has many special attacks: Jumping Dash, Double Attack, Blade Storm, Erg Beam, Erg Explosion, and Erg Black Hole.
  • During Glas Ghaibhleann's Jumping Dash attack, Glas Ghaibhleann will jump into the air and indicates a location with a red circle.
    • When the inner red circle reaches the outer circle, Glas Ghaibhleann crashes down at the location and deals damage.
    • A secondary purple circle may spawn nearby the main red one. Players hit by this will be affected by Erg Poisoning, which prevents all movement for 10 seconds.
    • If no one is hit????? by this attack, Glas Ghaibhleann will be temporarily unable to do anything.
  • During Glas Ghaibhleann's Double Attack attack, Glas Ghaibhleann will swing two swords similar to Girgashiy's Staff Swing or Hasidim's Double-Edged Swing.
    • This will deal damage and knock players back.
  • During Glas Ghaibhleann's Blade Storm attack, Glas Ghaibhleann will charge and swing two swords in a large circular radius.
    • When the inner red circle reaches the outer circle, Glas Ghaibhleann will swing the swords.
  • During Glas Ghaibhleann's Erg Beam attack, Glas Ghaibhleann will charge and fire a laser ray across the entire boss room.
    • The red laser will travel near to farther from Glas Ghaibhleann.
    • Getting hit will deal damage and apply the effects of Erg Beam After-effect (a variant of Phantom Roar), desummoning Pets and preventing players affected from summoning them for 20 seconds. Additionally, this effect prevents consumption of food or potions.
  • During Glas Ghaibhleann's Erg Explosion attack, Glas Ghaibhleann will charge and fire a large explosion around himself.
    • When the inner purple circle reaches the outer circle, Glas Ghaibhleann will fire off the explosion.
    • The skill visually resembles Bachram Explosion.
    • Getting hit will deal damage and apply the effects of Erg Beam After-effect (a variant of Phantom Roar), desummoning Pets and preventing players affected from summoning them for 20 seconds. Additionally, this effect prevents consumption of food or potions.
  • During Glas Ghaibhleann's Erg Black Hole attack, Glas Ghaibhleann will charge and fire Black Holes across the entire boss room.
    • Warning: Players who touch a Black Hole will instantly die.
    • The initial wave of Black Holes is incredible sudden. The only real indicator will be Glas teleporting to the center of the room to cast this Skill.
    • Black Holes persist for about 15?~25? seconds.
    • The number of Black Holes created will be between 12 and 18.
    • When players die to Black Holes, Glas Ghaibhleann's attack power is increased by 3?~5% (based on Dark Erg) each time.

Completed Glas Ghaibhleann Percent Health Minigames

Completed Glas %Health Minigames
80%	Orb Minigame
75%	Monster Summon
70%	Disciple Minigame
65%	Monster Summon
45%	Monster Summon
35%	Disciple Minigame
30%	Orb Minigame
25%	Monster Summon

• At 80% and 30% HP Completed Glas Ghaibhleann will begin an Orb Minigame where the goal is for the party to defeat four Orbs in 30 seconds.
  • Orbs will spawn in a square-pattern around the Boss Room.
  • If the party succeeds Glas Ghaibhleann will be temporarily unable to do anything.
  • If the party fails Glas Ghaibhleann will kill all surviving players and heal.
    • A Phoenix Pet's Flame of Resurrection, the Defiance Technique, a Whale Pet's (such as the Bareback Whale) Defiance, or Logging Out are some ways to avoid this Party wipe. Glas will still heal, however.
• At 75%, 65%, 45%, and 25% HP Completed Glas Ghaibhleann will summon various Dark monsters from Crom Bás.
  • The summoned monsters are permanent additions but can be killed and will not respawn.
  • It is recommended to defeat all of the enemies before proceeding with Glas Ghaibhleann.
• At 70% and 35% HP Completed Glas Ghaibhleann will begin a Disciple Minigame (called "Ritual of Darkness") where the goal is for the party to defeat four colored-Disciples, in order, in 60 seconds.
  • Disciples will spawn in a square-pattern around the Boss Room.
  • In the top-right part of the screen, players will be given a message indicating the color order that the Disciples must be defeated in.
    • Defeating the Disciples in the wrong order will flip the screen upside down.
  • During the duration of this Minigame, Glas Ghaibhleann will still be vulnerable to attacks.
  • If the party succeeds Glas Ghaibhleann will be temporarily unable to do anything.
  • If the party fails Glas Ghaibhleann will kill all surviving players, heal, and Glas' attack power? increases.
    • A Phoenix Pet's Flame of Resurrection, the Defiance Technique, a Whale Pet's (such as the Bareback Whale) Defiance, or Logging Out are some ways to avoid this Party wipe. Glas will still heal and power up, however.

Giga Glas Ghaibhleann Percent Health Minigames

Giga Glas %Health Minigames
80%	Disciple Minigame
75%	Monster Summon
55%	Monster Summon
50%	Disciple Minigame
45%	Monster Summon
35%	Disciple Minigame
25%	Monster Summon
10%	Monster Summon

• At 80%, 50%, and 35% HP Giga Glas Ghaibhleann will begin a Disciple Minigame (called "Ritual of Darkness") where the goal is for the party to defeat four colored-Disciples, in order, in 40~30 seconds.
  • Disciples will spawn in a square-pattern around the Boss Room.
  • In the top-right part of the screen, players will be given a message indicating the color order that the Disciples must be defeated in.
    • Defeating the Disciples in the wrong order will flip the screen upside down.
  • Each colored-Disciple is immune to some forms of damage.
    • Red is strong against Melee damage.
    • Blue is strong against Ranged damage.
    • White is strong against Magic damage.
    • Yellow is only weak to Pet damage, similar to certain Mag Mell enemies.
  • The time allotted depends on the Dark Erg. 80% will have 40 seconds; 100% will have 30 seconds.
  • During the duration of this Minigame, Glas Ghaibhleann will still be vulnerable to attacks.
  • If the party succeeds Glas Ghaibhleann will be temporarily unable to do anything.
  • If the party fails Glas Ghaibhleann will kill all surviving players, heal, and Glas' attack power? increases.
    • A Phoenix Pet's Flame of Resurrection, the Defiance Technique, a Whale Pet's (such as the Bareback Whale) Defiance, or Logging Out are some ways to avoid this Party wipe. Glas will still heal and power up, however.
• At 75%, 55%, 45%, 25%, and 10% HP Giga Glas Ghaibhleann will summon various Dark monsters from Crom Bás.
  • The summoned monsters are permanent additions but can be killed and will not respawn.
  • It is recommended to defeat all of the enemies before proceeding with Glas Ghaibhleann.

Rewards

Adamantine Coin Rewards	Gold	Dark Erg
x3 Coins on Friday to Sunday
1	100,000	0%
1	110,000	10%
2	120,000	20%
3	130,000	30%
4	330,000	40%
5	350,000	50%
6	370,000	60%
8	390,000	70%
12	500,000	80%
16	550,000	90%
22	600,000	100%

• Players will obtain "the Cat's Meow" Title and a Journal entry on their first Dark Erg Normal 0%-30% clear.
• Players will obtain "the Soul Severer" Title and a Journal entry on their first Dark Erg Advanced 40%-70% clear.
• Players will obtain "the Light in the Abyss" Title and a Journal entry on their first Dark Erg Elite 80%-100% clear.
• Players will obtain "the Usurper of the Abyssal Throne" Title on their first Dark Erg Elite 100% clear.

Giant Leprechaun

• Once per real-life day, each unique Party Leader can find a Giant Leprechaun inside of Crom Bás.
• Defeating it quickly enough rewards all players in the party with one key and chest. Rewards include:
  • Gold: 30,000 ~ 50,000 Gold in 4 Big Gold Pouches and 500 ~ 900 Gold in 16 Stacks
  • 4 Classic Gems, including Diamonds, at 7.00 ~ 10.00 cm

Clear Rewards

• Gold: (See Table) Gold in 1 Check
• Experience: 400,000 EXP
• Adamantine Coins: (See Table)

General Rewards

Normal 0~30% Dark Erg

One of the following guaranteed rewards:

• Grumpy Cat Marble x1
• Adamantine Coin x1~3 (Quantity based on Dark Erg)

Some of the following rewards:

• Enchant Scrolls
  • Dawn Enchant Scroll
  • Nightmare Enchant Scroll
  • Owl Enchant Scroll
  • Long-lasting Enchant Scroll
  • Heroic Enchant Scroll
• Exclusive Enchant Scrolls
  • Ambush Exclusive Enchant Scroll (0%+ Dark Erg)
  • Amnesia Exclusive Enchant Scroll (30%+? Dark Erg)
  • Backbreaking Exclusive Enchant Scroll (30%+? Dark Erg)
  • Meteoroid Exclusive Enchant Scroll (30%+? Dark Erg)
  • Reunion Exclusive Enchant Scroll (30%+? Dark Erg)
  • Stabbing Exclusive Enchant Scroll (30%+? Dark Erg)
  • Target Exclusive Enchant Scroll (0%+ Dark Erg)
  • Tournai Exclusive Enchant Scroll (30%+? Dark Erg)
  • Welcome Exclusive Enchant Scroll (30%+? Dark Erg)
• New Exclusive Enchant Scrolls
  • Pallid Exclusive Enchant Scroll (0%+ Dark Erg)
  • Heavy Rain Exclusive Enchant Scroll (10%+ Dark Erg)
  • Downburst Exclusive Enchant Scroll (20%+ Dark Erg)
  • Nightfall Exclusive Enchant Scroll (30%+ Dark Erg)
  • Glowing Sky Exclusive Enchant Scroll (30%+ Dark Erg)
  • Sunshower Exclusive Enchant Scroll (30%+ Dark Erg)
• Condensed Strength Fragments
  • Condensed Strength Fragment: One-handed Sword x1
  • Condensed Strength Fragment: Two-handed Sword x1
  • Condensed Strength Fragment: Lance x1
  • Condensed Strength Fragment: Wand x1
  • Condensed Strength Fragment: Staff x1
  • Condensed Strength Fragment: Knuckles x1
  • Condensed Strength Fragment: Chain Blade x1
  • Condensed Strength Fragment: Bow x1
  • Condensed Strength Fragment: Crossbow x1
  • Condensed Strength Fragment: Dual Gun x1
  • Condensed Strength Fragment: Cylinder x1
  • Condensed Strength Fragment: Control Bar x1
  • Condensed Strength Fragment: Shuriken x1
  • Condensed Strength Fragment: Two-handed Axe x1
  • Condensed Strength Fragment: Spell Book x1
  • Condensed Strength Fragment: Shield x1
• Crafting Materials
  • Awakened Strength Crystal x1
  • Awakened Strength Fragment x1
• Ascension Gems
  • Ametrine ? cm
  • Bloodstone 8 cm
  • Green Heliodor 8 cm
  • Heliodor 8 cm
  • Jade 8 cm
  • Jet 8 cm
  • Opal 8 cm
  • Phantom Quartz 8 cm
  • Pink Sapphire 8 cm
  • Red Heliodor ? cm
  • Tanzanite ? cm
  • Tourmaline 8 cm
• Potions
  • Comprehensive Recovery 500 Potion x20
  • Comprehensive Recovery 1000 Potion x20
• Free Repair Kits
• Miscellaneous
  • Spirit Gems (500) x1
  • Spirit Gems (1000) x1
  • Smoldering Thread x2~4 (Lucky x?~19)

Advanced 40~70% Dark Erg

One of the following guaranteed rewards:

• Dark Erg Fragment x1
• Adamantine x1
• Glas Ghaibhleann Heart x1
• Damaged Glas Ghaibhleann Feather x1
• Condensed Strength Fragments x1~3
• Adamantine Coin x1~3 (Quantity based on Dark Erg)

Some of the following rewards:

• Enchant Scrolls
  • Dawn Enchant Scroll
  • Owl Enchant Scroll
• Exclusive Enchant Scrolls
  • Target Exclusive Enchant Scroll (40%+ Dark Erg)
  • Coma Exclusive Enchant Scroll (40%+ Dark Erg)
• New Exclusive Enchant Scrolls
  • Pallid Exclusive Enchant Scroll (40%+ Dark Erg)
  • Heavy Rain Exclusive Enchant Scroll (50%+ Dark Erg)
  • Downburst Exclusive Enchant Scroll (60%+ Dark Erg)
  • Nightfall Exclusive Enchant Scroll (70%+ Dark Erg)
  • Glowing Sky Exclusive Enchant Scroll (70%+ Dark Erg)
  • Sunshower Exclusive Enchant Scroll (70%+ Dark Erg)
• Condensed Strength Fragments
• Crafting Materials
  • Glas Ghaibhleann Heart
  • Damaged Glas Ghaibhleann Feather
  • Adamantine x1
  • Awakened Strength Crystal x1
• Ascension Gems
  • Ametrine ? cm
  • Bloodstone 9 cm
  • Green Heliodor ?
  • Heliodor ? cm
  • Jade ? cm
  • Jet ? cm
  • Opal ? cm
  • Phantom Quartz ? cm
  • Pink Sapphire ? cm
  • Red Heliodor ? cm
  • Tanzanite ? cm
  • Tourmaline 9 cm
• Potions
  • Comprehensive Recovery 1000 Potion x20
  • Comprehensive Recovery 1500 Potion x20
• Miscellaneous
  • Smoldering Thread x?~5 (Lucky x?~?)

Elite 80~100% Dark Erg

One of the following guaranteed rewards:

• Dark Erg Fragment x1
• Adamantine x1
• Glas Ghaibhleann Heart x1
• Damaged Glas Ghaibhleann Feather x1
• Condensed Strength Fragments x2~5

Some of the following rewards:

• Enchant Scrolls
• Exclusive Enchant Scrolls
• New Exclusive Enchant Scrolls
  • Pallid Exclusive Enchant Scroll (80%+ Dark Erg)
  • Heavy Rain Exclusive Enchant Scroll (90%+ Dark Erg)
  • Downburst Exclusive Enchant Scroll (100%+ Dark Erg)
  • Nightfall Exclusive Enchant Scroll (100%+ Dark Erg)
  • Glowing Sky Exclusive Enchant Scroll (100%+ Dark Erg)
  • Sunshower Exclusive Enchant Scroll (80%+ Dark Erg)
• Condensed Strength Fragments
• Crafting Materials
  • Glas Ghaibhleann Heart (80%+ Dark Erg)
  • Damaged Glas Ghaibhleann Feather (80%+ Dark Erg)
  • Adamantine (80%+ Dark Erg)
  • Dark Erg Chunk (80%+ Dark Erg)
• Ascension Gems
  • Ametrine 10 cm
  • Bloodstone ? cm
  • Green Heliodor ?
  • Heliodor 10 cm
  • Jade ? cm
  • Jet ? cm
  • Opal ? cm
  • Phantom Quartz ? cm
  • Pink Sapphire ? cm
  • Red Heliodor ? cm
  • Tanzanite ? cm
  • Tourmaline ? cm
• Potions
  • Comprehensive Recovery 1500 Potion x20
  • Comprehensive Recovery 2000 Potion x20
• Miscellaneous
  • Smoldering Thread x4~6 (Lucky x?~?)
  • Spirit Gems (1200) x1

Trivia

• Crom Bás are Irish words for crooked, bent, or twisted (similar to Cromm Cruaich) and death, respectively.
  • Brielle recognizes this as the "old tongue" and agrees that it would possibly mean "twisted death".
• Merch Diafol are Welsh words for girl and devil, respectively.
• Before the Unveiled Abyss Part 2 Update, Irusan would still be the Final Boss even above Dark Erg 30%.
• Before the Crom Bás Dungeon Polishing, Anchor Rush, Tumble, and Wings of Eclipse were prohibited in Boss Rooms.
• Before the Crom Bás Dungeon Polishing, the Music Enhancement blessing would erroneously set the Cooldown for Encore to 0 seconds.
• Before the Crom Bás Dungeon Polishing, you would not revive automatically if you died due to remaining AOE effects after clearing Crom Bás.

Gallery

• 

  Official artwork of Crom Bas for the Revealed Abyss update.

• 

  The corner of a Crom Bas 'room'.

• 

  The Orb switch of Crom Bas, the Abyssal Orb.

• 

  Props on the offside of Crom Bas Rooms.

• 

  Props of the offside of Crom Bas Rooms.