I was doing the kobolds quest and suddenly a kobold casts darkfire on me. I checked through the logs and I am pretty sure that no party member cast the spell on me.
Very considerate, but I decided to post it in case it was a bug.
(http://img688.imageshack.us/img688/5269/qwdf.jpg)
Suicidal.
Yea, it was really damn funny when it happened too! Wanted to make their deaths quick I suppose.