G is for Grugánu, the Knower of Spells, Black Sword of Doom, Reader of the Incantations of Evil, and the Servant of Ksárul. He is depicted as a hulking half-human anthropoidal monstrosity concealed in voluminous black robes. Its head is that of a vicious buzzard.
Those who work evil in the shadows and cast evil spells, and perform dark rituals often call upon Grugánu and his demons. The god capriciously aids those who fight goodness/stability by granting spells from bygone eras. He is said to search and collect these forgotten arcane incantations, rituals, and spells for his master.
In many ways I think of this god as Ksárul's minion / sidekick. He is a bit one dimensional, but he does not have to be. I can see him more in contact with the demons and rituals used to bring them forth. He would make for a great messenger as well since his master is trapped in the Blue Room. Grugánu is always searching for the keys needed to bypass the walls imprisoning his master, and he would most likely aid any who share his goal to free him.
Clothing of Priests & Worshipers: His priests and priestesses wear robes of black and purple, and their headdresses have black felt with the god's symbol upon it.
Colors of the God: Black, dark purple, and a blue so dark that it is almost hard to distinguish it from black.
Holy Symbol: An open hand with clawed fingers outspread with silver upon it.
For more information on the goddess see Mitlanyál Volume 2: The Gods of Stability by Robert Alberti and M.A.R. Barker.