[quote=@Dead Cruiser]
[@Lady Selune] Xenos get cool xenotech, and access to literally every Astartes chapter through the DW. The Red Hunters work equally with each of the 3 Ordos, so really Hereticus is the only one without their own Astartes chapter. I'm not a fan of SoB (probably because they aren't my fetish), and the purview of Hereticus is like...

"We hate psykers!"

"Yes and what else?"

"We... uh... We hate psykers!"

Plus they're in bed with the Ecclesiarchy which is a whole other can of worms.
[/quote]

They hate Psykers, witches, mutants and heresy. Also, if you don't like Sisters of Battle, you can take yo heretical ass right the hell outta that door brotha.