How about:
Summnable by necromancer from
four corpuses, perhaps some cooldown 3
Hp: 5
Armor/P.armor: 1/6
Attack: 2 (1 range, 1 action/turn)
Speed: 4 (1 water, 1 forest)
Sight: 5
Bonuses: 50% infantry, 100% bulidings
Aura: Fear aura -
range 2, lowers only attack and armor of enemies by -3, doesn't affect other attributes. Can't stack with itself but is stackable with other fear scources. Affects all living units
Active ability: Absorb corpuse - like eat up corpuse, but you need
four corpuses around it, heals 2 hp, adds 5 hp, 2 attack, similar to veteraning (more corpuses - harder to destroy and heavier, so more damage dealt to enemy when rolling through)
Eat up corpuse (same as normal)
So basically it needs few corpses to be really useful but once you buff it up it can be a true pain, just look what values are those... Maybe too high. Also fear aura and bonuses.
I thought of ability to hit buildings with bonus instead of normal attack, and then it would lose hp (well a solid wall would probably crush this) but maybe that's too much...