Currently Death and Decay is dealing 100% damage on Faction Champions. Some people know it - others don't.
[ame="http://www.youtube.com/watch?v=ZQTzBQ4vijQ"]YouTube - faction champion 10 hard mod impie style[/ame]
This is NOT working as intended
Faction Champions can also be made easier by having a DPS focus a pet - the heals will switch to any pet under 100% life until the pet has 100% life.