MiRyA
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This can be implemented in a scenario. As far as I know, Ogo, the mapmaker, was creating something similar.
In NHF, there is a Necromancer who can turn towns into Necropolises, so it might be possible in multiplayer as well, if this ability is limited to 1 use (so that it can't be used constantly). For example, like dynamic groups.
Added after 12 hours 33 minutes
By the way, are there Naga dwellings here (like neutral dwellings) from level 1 to 7, and an outpost? (Anyone who knows how to use RTMG, please tell me).