wen ther PI and CI i usually just run past 'em. wen they have both imunes there usually not very powerful damage wise so thers not much to be scared of. but that my opinion...
Ack! Some people have all the luck! On my windys first venture out in hell Corpsefire was ci/pi. I quit, started a new game and ran across a ci/pi ghoul boss on the bloood moor! I ran from that one.