Grave Business
In these dire times, one has to look after his own, and you're a necromancer who is more dangerous than most; you're a necromancer with a business plan. Your zombies will dig up graves and loot valuables, and while they're at it, they'll grab fresh body parts so you can make more zombies to dig up more graves. Sounds good, right? Unfortunately, it's so good that other necromancers are after the same cemeteries you are!