if you don't move off of the hill against the wall of the room (tank pulls with shock) then adds *shouldn't* spawn, right away at least, giving you a bit more time
5th-
Burn, when he does 5 second countdown in say chat recall pets and run to center of room (so if an alt is called by door way it doesnt get everyone killed)
Runic salvo cast is just a aoe dot with a range of 100-150
he will drop traps that will port you underneath him and lock you there, avoid those
he will port around the room, when he does this, get to him quickly and use dmg skills on him right away, if he is not damaged in time he will cast annihilation and wipe the group
he will target 1 party member with a freezing or flaming ray, that person must run far away from everyone else and use serenstum, if seren is on cd have the warlock defense net you and pray that works, or you will be out for the rest of the fight dead or frozen.
If you are called with flaming ray, and unable to serenstum, a flame stone will appear on the ground lasting the remainer of the fight, anyone who gets close to them gets repeatedly knocked down while taking massive dmg, meaning the more mess ups you have the less room you have to move around without dying
If you are called with freezing ray, and unable to serenstum, you, and anyone near you at the time it hits you (range of 100 i think) will be frozen for the remainder of the fight, anyone who does dmg to the ice you are frozen by will take reflective dmg back upon them, likely killing themselves