Heh I just got really lucky and revealed the blood keep in a site search right next to my capitol while playing the new blood nation. Is this site Orania specific or is it just a random magic site? Seems fantastic... free keep and blood producing!
The blood units are good for defensive purposes, but if you take them marching away from the capital these blood units lose 2 hit points each turn.
Same is true with the commander, but a ring of regeneration should stop the loss of hitpoints for the commander.(theory)
I got the Illithid-producing crater in the beginning of one early-era game and both the Const. bonus and the Conj. bonus provinces on either side of my home province in another game.
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You've sailed off the edge of the map--here there be badgers!