Another new au idea! DigiRune: a deltarune and Digimon au where the darkners are the digimon. Its kinda both inspired by Digimon World 3 and Digimon Story Time Stranger (since I've been playing that game recently). Gaster is Mirei.
Some Darkners will have the suffix of -mon at the end of their names. There will be regular Digimon in the au too.
The way to get into the Digital World is by interacting with a computer connected to the internet, but it the rift between the Digital World and light world has to be opened as well.
Kris and Susie went into the schools supply closest only to find out that someone had set up a computer in there and there they went into the Digital World.
Each Dark Fountain location will be a location of the computer able to bring them into the Digital World.