I actually enjoyed this fight on both multiplayer and single player.
Single player I had most of my party (Me as Enchanter, Lohse, Sebelle) on the very top of the North platform raining Hell down on the adds. The Red Prince was quickly sent to the ground level to hold off any melee from reaching my ranged. When the Voidbeast teleported to my ranged, my Enchanter promptly teleported him back to the ground level into a waiting trap of electrified water and it was quickly over.
