Nultial Invictus

Nultial is a fallen Aasimar paladin of Bane who also serves as the leader of the Twelve Apostles. Though his true goals are unknown, he is a faithful servant of Bane and would do anything to further his one true lord's agenda.
Through a series of Scry spells and information provided by Laxius Seerym , Nultial seems to have gone mad and has abandoned whatever goal had originally brought him to the orient in pursuit of something else.
The group came face to face with Nultial and his dracolich mount Scream on the Isle of Lost Things where he underwent a gruesome transformation into an Aspect of Hiruko. He was killed by Prifddinas against Laxius' wishes.