how2karu dungeon (elf transformation quest...thing?)

[Sandrie]

I was working on my elf's tranformation quests, and I went to karu dungeon to sketch a "Stone Horse Keeper", and got the crap kicked out of me before I even got there >.>

So the second time I went with a party but we didn't fight the boss monster I needed to sketch ._.

Do i need a special item to use on the altar? Or what? Am I doing this wrong? help please ;-;?

[n00bE]

You just need a normal item to offer (5 floors)
Your party was probably doing a Final Hit dungeon (3 floors) or some other special dungeon