From now on I'm treating benign necromancers with exactly the same prejudice as werebeasts. It's been a rough three years in Swiftmob. The onslaught never ends, from the coatis to the mandrills to the crundles to the troglodites to the ogres to the rutherers to the voracious cave crawlers to the green devourers to the fucking giant cave spiders. I reached the point where I had over 50 cages full of these things (a fraction of what I've had to kill), and I finally dug a shaft all the way down to the magma sea - the hole - where I could make them all go away (and get my cages back).

I don't know how, but a giant mole was able to grab the wall on its way down and climb back up. The military attacked it, but not before 20 or so dwarves guiding troglodites to the hole got spooked, so the troglodites escaped from their guides. The military killed the mole, then started fighting the troglodites, and before you know it a necromancer is raising every fucking corpse and body part it can see. There's like 50-100 units in combat at this point, blood and vomit everywhere. Surprisingly few losses, but three months of hauling gore and dropping it into the hole in a race against the clock to beat the miasma has probably killed the fort.