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This one line bothers me...
[Aodhan]
Now there's only one dungeon left at Emain Macha, Peaca Dungeon. I'll give you the Command Sheet that was found there, so please help us out one more time.
You can make Peaca Dungeon Pass by using your Handicraft skill to combine the Command Sheet I gave you, along with Holy Water of Lymilark and Mana Herb, just like last time.
Peaca Dungeon is a place where the Undead appear quite frequently. It's a dungeon infamous for having the powers from Another World transferred directly to that dungeon. You've been doing great so far, but I strongly advise you to be extra careful this time around.
Once the restoration is complete, please come back and report to me.
Once that's complete, your mission to restore the dungeons at the Emain Macha area will be complete.
...Good luck.
So this pretty much confirms that Peaca Dungeon is related to Tir Na Nog in some way.