"The Grey Knights are the legendary Chapter 666 - and although nominally a Chapter of the Astartes, they are in the Chamber Militant of the Inquisition. Each member of the chapter undergoes a gruelling and torturous selection process, and even once inducted, their harsh training regime is without equal. In battle, they move as an army of silver ghosts, surrounded by awe, and equipped to the teeth to deal with the worst foes that Chaos can raise to meet them."
-The Grey Knight wiki page on lexicanum
This Grey Knight kill team includes almost every Grey Knight unit as an operative made for kill team including Brother-Captains, Interceptors, Paladins and more. Some rules are inspired by the Chaosgate Daemonhunters game.