Does anyone know if Howl of Terror works on Empress adds?
No hard CC works on Empress adds. Only stuns and snares.
Careful when you stun, the stun can sync. their swing timers and burst the tank.
We have our tank call out for stuns to ensure that he has some form of (small) active mitigation up. The RNG gods are not always kind, and a sync'd swing to a not topped off tank can kill them.
Indeed, you'll be fine.
Another friendly suggestion is to single target them down. Keep 3 on your most durable tank, kill two on the softer tank, have the softer tank taunt one off, kill another, etc.
We always end up ahead on adds in our 10 man, so we actually have to stop DPS and allow the remaining wind blades time to drop more sticky resin. Good luck!!