[@Pathfinder] I like him.

With regards to the whole blood smelling business, you mention that the blood must be warm for him to track his prey... but er, surely the blood cools down before long? Maybe just expand on it a little bit. 

I mean, if he injures someone, and they run off - but there is some of their blood on his weapon/teeth, can he then form some kind of permanent hunter's mark on them which will last indefinitely until he catches them? Or would he just merely be able to follow the trail of blood left behind by a fleeing wounded foe? 

Sorry if I'm being daft, and I know it's a bit of a moot issue, but it's the only part of the CS that didn't click right with me. Otherwise everything looks great.

EDIT: Errr, obviously I'm just a scrub and this is just my friendly opinion, so feel free to beat me away with a rolled newspaper.