Eater of the Dead

[Forrest]

How about he builds a type of "Void gate" in the province he kills. Then summons more of him and bizzare evils to guard him.Then when he has powered up and has a small army of summons he goes eating provinces.

Meanwhile One of him that he has summoned stays in the province summoning more evils till a second army is formed around him and he goes eating leaving a third him to repeat the process.

Any unit entering the "Gate" province has a bad chance of getting a affliction each turn until the gate is destroyed. Only a Mage with a special group of powerups or skills can destroy the gate with a high chance of death or being feebled.

If the gate is left alone it has a chance of spawning a new Eater and other evils every turn. Along with bad random events in surrounding provinces.

Damned if you attack and damned if you don't.