took us alittle longer then that but not to bad. only 1 or 2 of my group had done it before. in the end we decided to say F the oracles and F the extra chest for not letting him teleport. everyone gather on the one side and kill the harpies, drop the shield during the ritual then snipe/LMG his ass. killed him before he enraged. just took a few tried to come up with a plan.