okay, definately dispel it's protect first. then use 3 character's quickenings. then try attacking it then and there. stock up on hi potions and such and such. make sure you still have a character to heal you. if you're really good at quickenings, use one character's quickenings and use mist charges on the others to get a result. if you want, you could use a megalixir, cause that's what i did, but don't. i still don't know how to get it back. anyway, i think i was the same level as you so keep trying and good luck!