The Phantom Knight
Once an ascetic of Irori, but got tempted by promises of power from an anonymous, shady contact (Tiadora), killed his neighbours, fellow Irori ascetics, and ultimately his younger sister and father. Upon killing his last remaining family, he loses any empathy he may have had before and becomes ready to fully devote himself to Asmodeus.
He gained the ability to channel Asmodeus’ flames Favored heavily by the infernal prince himself, even Tiadora has some respect for him and perhaps even some jealousy.
Just as he kills the last remaining person in his town, a ship pulls up to pick him up to Farholde.
Interestingly, he was a friend of Darnoc Thrune years ago.