Geshniz is the Black Ring General and disciple of Damian that rules the fortress near Maxos Temple in the Broken Valley after the region is attacked by the Damned One. She can be found in Geshniz's Headquarters, and is in possession of the Potion of Wisdom required for Allan's quest Wisdom in a Bottle. A note addressed to her (A Word of Warning) concerning the potion can be found in the hallway outside her chambers.
She appears to be in contact with her fellow botany enthusiast, Rayhun, as evidenced by the Plant-juice-stained Correspondence found at Rayhun's Headquarters. This is also apparent when mindreading Geshniz, which reveals: "I don't care how Rayhun threatens, that collection of formulas is mine and mine alone."