Old World: Naggy/Vox
Outer Planes: Inny/CT
Kunark: Phara Dar(maybe)
Velious: Kerafyrm or Vulak`Aerr)
Luclin: Aten Ha Ra or the Emp(which ever you think had better loot =p)
PoP: Quarm
LoY: Inny I guess
LDoN: NO idea was never beaten.....or finished...
GoD: Turnat Muram
OoW: OOM
DoN: Vish
DoD: mayong
PoR: ARo