I was doing a quest and happened upon this champion. I tried to kill it to see if there was a ToK unlock for it. I got it down to what looked like no HP then it just stayed there for like four minutes before it full healed. I tried two more times and the same thing happened . It could not be killed. I have posted a picture of it with this report.
Steps To Reproduce
The steps to recreate this were just to engage the mob.
