Necrobane

The undead horde is unstoppable. A lone necromancer has ascended the unholy ranks and needs only one more complete decimation to rank to the highest rank under his dark goddess Mortua. The city has been razed, his army swells in numbers... But there is a problem. A mysterious force is cutting down his minions and averting capture. As long as a living force remains within the city, he cannot claim victory.
Deciding he must see to this threat personally, he discovers something hiding in this city that not even his goddess knows about. Claiming victory against this may grant him more power than any necromancer before him... if he can succeed.