Deltarune takes place in an alternate timeline, so it doesn’t take place before or after undertale. The monsters were never driven underground. Asriel lived and grew up and went to college. Undyne has both eyes and has never met Alphys, who is more into western comics and cartoons instead of anime and manga (tho she started reading Mew Mew Kissy Cutie recently). Bratty and Catty aren’t BFFs, they hate each other. Mettaton is still a ghost. Toriel and Asgore got divorced for probably normal reasons. Gerson Boom and the Shyren are dead. Sans fucked your mom.
the idea that UNDERTALE, one of the biggest games in recent memory, might have just been a setup for the TRUE game of deltarune is absolutely fucking me up. for literal YEARS people have been trying to make sense of gaster and his followers –
nobody could agree on what this stuff really meant….. but then you look at them in the context of deltarune and some of the pieces start to come together. that’s absolutely crazy dude. there was no discernable reason for these things to be in undertale because they didn’t BELONG in undertale, they belonged in DELTARUNE
did the name undertale even come first, or is undertale an anagram of delta rune to begin with? honestly fuck you toby fox