Eldritch Grimoire: Nightblade (Patreon)

Nightblades are rogues that enhance their skills of stealth, agility, and assassination with shadow  magic fueled by the Shadowfell itself. This archetype originated from the ancient netherese flying city of Thultanthar, the City of Shade. The city avoided the fall of the empire by plane shifting into the Shadowfell. Nightblades were trained to use magic from the realm of shadows to spy on and eliminate any netherese nobles or wizards that might stop the eventual return of the city to the material plane. When the city returned and was brought to ground by Elminster himself many nightblades fled the city and spread their techniques to the criminal underworld of Faerun.

Art by Vetrova on Deviant Art

This is a revision of an older subclass that needed an update.