Sniksis

Sniksis is a Fallen captain of the House of Salvation and the twin of Piksis. It is first encountered in The Kell of Darkness at the Crux of Darkness, where it engages the Guardian alongside Shanks. Sniksis guards the entrance to Gale's Watch, and killing it lowers the barrier there. It returns in Empire Hunt: The Dark Priestess, where it is killed, ending its story.