Sacrifice, Damaging yourself to prevent damage to you. Options

[Karoline]

So, I was looking through blood magic and particularly sacrifice earlier to see if there was any ability to sacrifice yourself in order to gain some kind of an edge (And possibly create a 'good' blood mage). The book said that you could sacrifice yourself, but the only thing sacrifice does is reduce drain. So the book allows you to deal damage to yourself in order to reduce how much damage you take. Seems entirely pointless to me.

I did however notice at the end of the description it said that 'sacrifice opens up several more advanced metamagics' but the book only lists a single other blood metamagic. Is there more in some other book, are there perhaps plans to release more stuff for the twisted paths, or is that sort of a push to come up with unique metamagics that make use of sacrifice?

I could imagine converting the drain reduction into a force improvement and extra casting dice or pure hits not bound by spell force would be a cool use of self sacrificing. Any other ideas out there?

Edit: I did realize there might be some potential for this to be useful because you could heal sacrifice damage to yourself but not drain damage.