Eater of the Dead?

[Peter Ebbesen]

Each month, the Eater of the Dead will eat some of the unburied corpses in the province it is located. It grows larger and meaner the more corpses it eats. It is, essentially, a one-unit undead army that is very, very, hard to destroy.

You are warned in the monthly log when the Eater of the Dead grows in size. Each time it grows in size it gains 120 hp (and a corresponding hike in its regeneration), improves many other stats, and gets additional attacks.

When it grows too powerful... It will eat anybody. A good weapon, but one that should be used offensively. When it goes rogue you want it to be deep in enemy territory so killing it off is the enemies problem.

As all single units, it is very vulnerable to direct targeted spells that puts it out of business - so the way to take it down is by magic, not armies. It eats armies for breakfast.

An ideal unit to summon for your main army just before it goes on a rampaging trip through enemy territory.