If you have 2 tanks, 1 being pld, have the pld be on stuns, only stun eruption. The plumes order is outside aoe inside aoe. He will usually do an eruption in between the plumes. After the nails are gone the plume order changes. It will remain out > in but it will also be one the takes up the arena minus right around him so have everyoneminus main tank crowd behind him. When he jumps just avoid the line he runs.