Blood's my favorite. Definitely not the most versatile, but fun non-the-less (unless you hate the micromanagement aspect of it...understandable)
The Blood must flow.
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Dwarf Fortress: The Grand Sixth Hall
I like blood, not for the combat spells, but because I always was a bit satanic at heart, and it lets me summon all sorts of nasty demons from the underworld and all that. Plus, I love the heartseeker axe