Page 7 & 8... Shadow Wizard or Killing numerous Hornets?

With a good party running Shadow Wizard on Int (3% chance it says) 8 chances of shock 7 appearing at the end chest, plus running the mission is easier with more stronger players. Though it will require a lot of coordination.

EDIT: Ironically, the fastest way to run shock in Shadow Wizard, is with shock users spamming it at each orb, killing every enemy that spawns in a aoe. Shadow wizards only requires 8 orbs to be triggered to fight a boss unlike shadow commander's 14-16 orbs...

At the same time having a party endlessly killing hornets may have the same effect, but I don't really like field drop rates as they almost never give me anything due to my high CP (hornets are 'strong' to me) other than pollen and honey and gold...

Red Eye Ornata Spiders don't really spawn in a group, hence more isolated and slower to kill than the hornets... But page 8 and 10 is more commonly attainable via ancients and the likes.