[Saulot]

This one of those things that always bothered me, blood magic shouldn't just be about sacrificing slaves, though that's certainly an important part. Another good method would be sacrificing of self, as in cutting open bleeding wounds of various sizes on one's own body. This actually does fit historically with what we know of the Maya and Aztecs.

When I first tried the dom series, I was somewhat surprised there was no 'hitpoint cost' spells. I suppose it might be difficult to balance with healing spells and regeneration, though in that sense, the spells/effects shouldn't work on a blood mage.