[@Lmpkio]
	The blood magic is limited, as if he wants to cast it on the fly, he has to tote around a group of virgins to kill to cast it. While on his home turf, this would be extremely difficult anywhere else, as, well, they put collars on them to make them mindless. If someone ELSE kills them, it also deprives Roshan of their use, as he has to kill them to get the power for his spells. Also, you could free them, if you're sneaky/ballsy enough. They'd literally stand before a train, and get smeared over the tracks, level of mindless. As for the bleeding, it's not an instant kill. It can be stopped by either being resistant to magic, not bleeding at all, healing magics of any kind, ext. 
	Also, I wasn't intending for him to be able to. At least, not with most. Stuff like Kevlar, maybe. Stuff like space marine armor, of hella no! Tanks and such, also no.