I’ll be honest Gloomtale came from just a little crossover RP thing i wanted to do (and have in the works! it’s fun) and the basic guideline is Mt. Eboot is in Gloomverse. so when Monsters are released to the surface, it’s in gloomverse. that’s the basic of it.
of course, Undertale and Gloomverse have different Magic systems. with discussion with some other fans, we managed to figure out a basic way of making the two magic systems work. Undertale Magic is based heavily upon the soul, while Gloomverse Magic is restricted to Hats/wands. In Undertale, it’s implied Human Magic was rare, at least when the war occurred. yet in gloomverse in commonplace. the fix? the war was before magic was really a known thing (before the correlation to hats was connected and hats became commonplace). as such, when monsters reach the surface and find that a majority of humans are “wizards” it’s a tad more terrifying.
if you have more questions, please ask! I obviously don't’ have everything figured out (like I literally just thought about lemonheads and honestly have no idea how they fit but then again they’re a mystery in comic still) and being asked may help me think about new issues and what not!
the majority of the ‘story’ i focus on is more so Ambassador Frisk at this point of time, as that’s the story the RP that spawned this all started with.