azakh-kul throatcutter immune to damage, chain CC from them.

I experienced about 6? 6 of them chain freezing me in the Sulphiric Caverns, and running at me with perma haste - but the kicker was they were immune to any form of damage, with the only modifier they had being "minion". I had to abandon my ritual and breach.

Had somewhat same experience - I kept killing all the pack - but they revived as fast as I killed them.