Board Thread:Fan-made Monsters/@comment-27950421-20161103043355/@comment-26376061-20161104124405

...did I say anything about the source material being where I read that? Try the Fan Fiction Archive. The full moon thing is simply a trait used by fans in their stories, sometimes to great effect. Since the source material doesn't say that doesn't happen, a lot of people assume it does, because there's a lot that can be done with "the monsters go crazy on the full moon", from an explanation why the stoic character raped the MC, to an explanation why the MC is afraid to leave his house because he'll get raped...which works fine...except for the Oomukade under the floorboards. In my mind, it is canon until proven false. It's just another assumption that we make about MGE which may or may not be true because the author never addressed it.