Rift Quest:Awakening to Nightmares  

Xatax will awaken two Iron Arbiters, one at a time, then a whole bunch. Don't Panic! A bunch of your Icewatch friends show up to help! After, Xatax attacks but he is a total loser and you kill him easily.

After Xatax is dead, use the Planar Gate control he was standing at to open a portal back to Defender's Stand.