Also I'm in a Grouptale-type role play and I drew the fallen humans we RP as
(I'm purple)

Note: I was coloring this while I was supposed to be showering so it's kinda crappy
(Sorry if that's off topic, I don't think it is...)
As for tips for CORE, I guess move around as little as possible? Like only go where you should... Also, memorize how to spare/defeat the monsters. I tried Hard Mode first so I knew how to SPARE final froggit and whimsun, good luck!
I have a cool idea for an AU ish
But y'know how the Barrier doesn't let anything out once it gets in?
what about time?
Is it trapped in the Underground?
Is this the place where time comes to die?
How does time flow work in the Underground? Is it constantly repeating the same day over and over again, but the residents change their decisions? Or is time sped up, have they lived millions of lifetimes in their prison?
(I'm tired and inspired)