PeacefulMode+ is a mod like PeacefulMode, however this obliterates the Maskling's stats into oblivion, killing them off, both the units and the buildings. I haven't got access to a save to check the buildings, although the units, as far as I am aware, are killed off. The stats are all set to 0, so if for some reason some of the units or buildings (if still existing) seem impossible to beat, please let me know and i'll change it.
This mod is compatible for 1.24 and edits the Maskling's stats, so do not expect it to be 100% version compatible with future versions.