Here's the thread that talks about this.
Here's the video from that thread:
Now THAT is the first time I've ever seen the "Immune" message float above someone's head, and since he has one percent over immunity, Immolate actually heals him.
This is a thing of beauty my friends because getting your fire resists up beyond 100 percent is no easy task. How he did it? As he states on that thread, "molten mantle, reckless runners, some 30% fire resist robe (bazaar), heartsteel, and a 24% fire resist burnzilla."
You gotta give it up to him for building a gear set specifically for use with the immolate spell, which usually damages you for 250 and hits your enemy for 600.
I don't know if this is even possible for other classes, but imagine a necromancer who healed himself twice over with a sacrifice or who could gain life through the empower spell. Now that would be pretty awesome. :-)