Priest - lots of aoe heals, shield and renew. Fear. Also can dispel magic and resurrect. Minus is that you have to stop your movements to make good enough heals (dont think prayer of healing and that insta party heal are good enough, am I mistaken?). After all it is clothie
The fear will share a DR with all your warlocks fear, if you haven't figured that out by now.

In the upcoming patch all CC is getting nerfed to 10s durations, so I can only assume its 10s, 5s, 2.5s, immune for 15s.