I was just doing a Tier 6 Infernal Horde for the Materials with my Sorc and I was on Wave 3 and at the end of it there were 2 cannibal dual wielding axe type NPC’s that were still trying to kill me… but they were UNKILLABLE!! I could outrun them because of the extra speed boost from 1st wave… but I could not kill them nor portal out… after a min or better of just outrunning them and trying to max DPS, I had to just give up and let them kill me. They did despawn and the 4th wave started, but that does not seem fair at all. How and Why is there unkillable NPC’s in the Game???