No, I'm not talking about from dread.

I've been doing the vol 1 epic line on my hunter (on 1.12.3 now, at level 50) and I've come to notice that angmarim everywhere are now doing the 10s cower/"stun" ability that made its debut in Mirkwood.

I got hit with it by random normal or signature type angmarim dudes in Annuminas, random normal type angmarim dudes in angmar, and I get it on the angmarim types in the rift skirmish as well (on solo mode.)

My guard doesn't much care about being incapacitated for 10s with 3 mobs beating me up, but for any of my squishier classes this is downright painful.