Summons

[Micah]

Abominations are the best unit in a melee for the cost, but they're hard to get around, and need mage support for a protection boost if you'll be fighting chaff with a lot of attacks, but they do great against thugs/SCs.

Seraphs are excellent defensive SCs, but suffer from a crippling vulnerability to magic duel while attacking.

Bane Lords are always a cost-efficient staple. There's not all that much variety late game though, mostly tarts/aboms with a smattering of angels.