The Night Serpent
From Sourcebook Wiki
The Night Serpent is the only demi-god to have ascended *after* the death of the Eight, rather than during. A servant of the Dark Lord, the Night Serpent assassinated the Lady of Twilight and assumed her power. It was this assassination, as well as the disruptive affairs (romantic and political) of the demi-pantheon itself, that led to The Retreat.
