Flesh Tearers
Angry Fuckin Vampires, oh yeah. They're a second founding chapter and as such are fuck old. They were originally a crusading chapter like the Black Templars, but decided to set up their fortress on Catachan2 Electric Boogaloo, otherwise known as Cretacia. For fucks sake can't GW at least try to make the names sound a little different. They came to this decision after their scout company was eaten by bugs. More hardcore in general than the Blood Angels, since they've all got a bad case of Geneseed AIDS, probably from drinking a thousand gallons of blood from Slaanesh followers every week or trying too hard to be cool, they've only got 400 Spess Mareens to call on and most of those are bugshit nuts. You might suppose that this situation would make they wax emo like the Blood Angels sometimes do, but they cope by rushing at heretics and drinking their blood after they're done powerfist fucking them. The only Wangsty member is the Chapter Master Seth, but even he usually just shrugs and slaughters a few thousand civilians to make himself feel better, for the Emprah of course. Also ANGRY FUCKING DREADNAUGHTS.
In summary, NO FUCKING SPARKLES *BRBRBZZZZZZZZZZZZ*