Gahz'rooki Summoning Stone summons Gahz'rooki, a Rare Aquatic Battle pet. It is an extremely rare drop from Hellscream Laborers, Kor'kron Marauders, and Kor'kron Earthshakers in the Northern Barrens. It can also be purchased from Ravika or Tenuki in Durotar, for one Radical Mojo, a reward for the weekly quest Battlefield: Barrens, which is no longer available as of Patch 5.4.