The Keeper of the Dishonored Dead is a mythological figure in Klingon beliefs.

Quark once compared the Keeper of the Dishonored Dead to the Bogeyman of Earth, the Nameless Traitor of Cardassia and the Smiling Partner of Ferenginar. (DS9 novel & audiobook: Legends of the Ferengi)

The Keeper of the Dishonored Dead is probably a figure who controls Gre'thor.