[Baalz]

I also have to point out that blood is a late game powerhouse to, though much fewer people leverage it properly. The reason is because a good late game death gem income is 30 gems per turn (yeah you can get more, I'm just saying the ballpark you "usually" have to play with). A good late game blood income is 300 slaves per turn. Is a disease demon better that an ashen angel? Probably not. Are 10 disease demons better than one (potentially backfiring) casting of manifestation? Hoard from hell can be even more effective than ghost riders in certain situations and is available much sooner and more easily castable (assuming a good blood income)...and if you want something more analogous to ghost riders there is send horrors, and heck that one even comes in a much more accessible lesser form which still does a good job clearing PD.

As far as overpowered unresistable spells how about the only two truly unresistable spells: go to hell. Only marginally more resistable and castable by very cheap mages: leech. With an AOE 1, high, AN damage leech spam is truly fiendish against elite troops, and it cares neither for your antimagic nor your armies of lead.

I'd put late game blood - properly leveraged, on the same level as astral and death.