[Executor]

I'm also in favor of rebalanced blood prices and bringing back SDRs. These last few posts sum up perfectly why removing them was a bad idea.

As for the blood prices, I think the main problems are vampire lords. Frankly, any blood summon compared to them is hardly worth it. I find them completely OP, I'd increase their price by say 1/3, to 99.
With enough vampires lords you sort of become unconquerable, and with the current price of 66 you can very easily summon 2 to 3 of them a turn meaning that I pity the fool trying to go up against a few dozen vampire lords, probably backed up by a few hundred vampires as well on top of anything that nation might have besides blood.
Also, bone fiends are still OP even with 7 for 3 slaves. It's not really hard to completely trample a nations with them early unless they have powerful archers. Instead of lowering their number I'd suggest an increase in price, say 5.
With their current price you can mass hundreds of them pretty fast even in early game.