Never-Born
From Exalted
The Gods of The Underworld
Stories tell that these are what remains of dead Primordial Titans: ever-existing, yet cast from Memory, they now inhabit the Underworld, building their malice and spite, that one day they may return to reclaim all that was theirs.
Of course, these are only stories, and there are as many versions as there are story-tellers.
Some have them as The Gods of The Gods, others as Rivals to The Gods, defeated in an apocalyptic battle in Heaven. Others still say they were The Original Creators, that turned jealous of that which they had created.