Armageddon

[Zeldor]

Armageddon does kill blood nations. It's 25% pop per one. Few of them and blood income is decreased by 90%. Also the damage to troops is mundane and very random, so protection helps. But yep, giants don't suffer. Well armored troops have very small mortality rate. High-hp non-armored units can get afflictions. Even well armored tartarians can get them.

And if you can wish for slaves every turn, you are not a blood nation. You are astral nation.