Good stuff! I'm liking that Blood Magic is brought into the picture. Neshara is going to involve herself heavily with Blood Magic but as stated in my mission statement she does not conjure anything that does not already exist (I'm assuming Blood Magic has always been there, just not explored except by Rahisael until now but still, Neshara is fairly ignorant to begin with).
If you want a osunding board to bounce idea's give me a shout, I can help considerably the with the mystical/philosophical side of the art as I used Blood Magic heavily in an old D&D campaign of mine. If you want to retain creative control over your revelations that's fine, ubt I do have one request
I'm trying to introduce the idea of primordial magic into the game as an intuitive "art" form of magic that is the polar opposite of the ritual "science" magic taught by the mage gods. Could you align your Blood Magic with the idea of this primordial magic? It would be cool if Aaseral jumped on board with the primordial magic thing too, although his Life Magic uses runes I personally see that as being a way to bind and focus primordial magic in the world.
Also I love the idea of the spider teaching Rust this magic. I've already mentally altered one of my actions/plots to incorporate this spider into the mix! I really need to get going with posting, the idea's are burning the inside of my brain! I've already begun writing out my actions (and the wiki entries to go with them)... It feels like a form of creative trepanning!