![smile_teeth :D](/forums/images/smilies/smile_teeth.gif)
Still, the gauths and beholders are cheesy creatures, so just get the equally cheesy shield of balduran from the adventurers mart, which reflects their beams. Equip it one one guy and send him in solo, and watch them kill themselves.
As for the celestial fury, it's in the temple district, look for a house on the map marked Guarded Compund.