So, on maps with many towns, Necropolis will have an extremely high Town Economy (TE)?:)
Okay, forget about TE, I'm interested in this: let's say I've moved quite far from my castle, and there's no portal to the town yet. Suddenly, our "nasty guy" pops up out of nowhere, converts my town, and runs away. After retaking the town, I'm left with a Necropolis that I don't need (assuming I'm not playing as Necropolis)?
Some have a special ability to steal armies, while others can turn a town into a Necropolis.
Added after 11 minutes
It would be better to make the conversion based on the duration of the Necromancer's ownership of the town, and preferably with the buildings preserved.
Maybe save a variable containing not the true magic value, but the value that the special ability has changed it to?
Added after 7 minutes
But all these formulas are terribly ugly...
Maybe we should give this special ability to the Dwarves?