That's so fascinating! Can you do it at will? I've heard of mages who can transform themselves, but it's usually into animals. I can't do that, but I think if I could I'd like to be a bird. Flying seems very fin.
Oh, the blood's donated? That must solve so many problems! I know it would back home. It would make things a little less painful for me, too. It would make things easier to just carry around a little bag of blood, but I wouldn't imagine it would last long. Wouldn't it get clotted?
All that is to say, if you need blood I suppose I could give you some, so long as you asked nicely. And let me know beforehand. I'm always a little woozy if I bleed too much, so I'd like to have water and snacks.