AnotherGame is a mod for ToE 3.1.

Since there is a conversion mechanic, it makes even more sense to implement it this way; otherwise, Necropolis loses its classic advantage: because before, only it could effectively use captured castles, and now, it seems, everyone can.

But it's not that simple: conversion destroys all buildings, and it might not even be desirable for Necropolis to convert a built castle, unless, of course, it's afraid of losing it immediately...
We could also borrow something else from the sixth game, but only something useful.