Basically, our town will be similar in strength to the Dungeon. That is, very strong magic + strong and powerful units will make it a quite powerful castle, but it won't stand out from the balanced lineup (I might be revealing some confidential information now). Testing has shown that the Haven and the Conflux (recognized leaders) can easily defeat the Necropolis, and there are difficulties in battles with the Inferno.
Now about the creatures in the fourth game, they are some kind of mutants. In general, the ability will be implemented, but on a monster that only remotely resembles this creature.