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Drop locations
Fragment of a discussion from Talk:Ancient Treasure Chest Event (Dec. 2010)
I can confirm that it drops from both Iria and Uladh dungeons, and normal dungeon mobs. Ran Alby normal with a low CP character (white spiderlings were same level thanks to Abysmal pot) that has about 60 luck and managed to get a few chest pieces despite the being only a few rooms. Your difficulty may be due to either a high CP, or low luck stat.