Shivan Obliterator drops aggro and heals repeatedly (The Beast Beneath the Mountain)

[Akkhan]

Was trying to run this with my brother, and while we're engaged with the thing, it will stop fighting for a moment and turn around, then turn back after healing back to full in an instant. Didn't look like it was just insane passive regen, as it happened irregularly, though we never got him below 90/100 before it would regen to full.

[Ura Hero]

If everyone is ranged, this can happen.  Used to happen a lot of Live to a group of folks I ran with. when we would forget and bring all ranged toons to a Task Force.

[Akkhan]

Ah, I had suspected maybe having a face tank would help. Thanks for the info, I'll try that next time.