From Otus' back cover to DEITIES & DEMI-GODS, three dead* and mysterious godlings. Some sketchy details below. FIRST COMMENT STATS & DESCRIBES ALL THREE.
I. Ammon Thrax, former godlet of the Black Sun
II. Numathoth, former godlet of gnostic revelations
III. Panathoth, former godlet of the circulating library
*Dead gods are trapped in the Astral Plane for eternity as non-corporeal phantoms with little to none of their former powers -- but often long and detailed memories. They have no worshipers.