Hunting the Daemonic Remnants

(A group of 40k Grey Knights ends up in RWBY...All hell breaks loose [literally and figuratively])

On their way to Titan, a group of Grey Knights find themselves lost in the warp, battling daemons of an unknown kind, before eventually, they manage to pull themselves out. Unfortunately, this results in the ship being damaged and above a world, one in where the Astronomicon was difficult to find... Unfortunately, without any access to the Imperium, they are forced to make do with...unconventional means of warding themselves and this unknown planet's populace... Their duty is to safeguard Humanity from the Daemonic servants of Chaos... and they did so...

On Remnant, tales of Knights and Paladins in grey, who's valiant and heroic actions managed to save many would be spread... though one day...they vanished...That was nearly 666 years ago... now it was time for the Hammer to rise from their slumber... One...by...one...

though as time passes, the warp becomes harsher and aggressive... Remnant's people would need protection from it...And the Grey Knights will fight... for there is only war