Talk:Demon Lord/@comment-27036092-20161122183415/@comment-10429980-20170226172257

The existence of the present monster population in general is enough to keep a mamono realm a mamono realm (and its questionable if removing all monsters would even cause a land to revert to its former state, or how long it woudl take if it did). The Mamono Lord is utilizing the energy she builds up mostly to empower herself and combat the old setting.

For that same reason, even if she could do it, releasing the energy she builds up to create dark matters is probably not something she would want to do much. Mamono realms expand simply form her own power increasing (and dark matters only seem to radically expand mamono realms on the rare occassions where one leaves a existing realm). There may be more to it as well, given how rare dark matters are even in ideal conditions.