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I'll still add a Necromancer who can convert enemy towns.
Okay, never mind, TE aside, I'm interested in this: let's say I've moved quite far away from my town, and there's no portal to the town yet. Suddenly, our "nasty guy" pops up out of nowhere, converts my town, and runs away. If I retake the town, will I be left with a Necropolis that I don't need (assuming I'm not playing as a Necromancer)?