I'd recommend something like this for the locks.

http://www.wowhead.com/?talent=Iq0rrRfzoZbxczIiz0es

It's a different variation on a SL/SL build. I don't think that you are going to use the other curses as often because of how fast you will be putting out damage, so 2 points in improved CoA instead of fel con. Dispelling also shouldn't be a big deal because of the sheer number of dots you are putting out, so shadow embrace for the dispel protection isn't necessary.

Basically just run around using your 3 instant cast dots, then if you get people dotted you can drain for some serious damage.

I'm not sure how nightfall procs will work multi-boxing, so that might not be necessary to get.


I don't know a ton about priests, but the warlock build should work really well with 4 of them.