Best Undertale Discord Servers

Undertale servers have outlived the game by a decade, largely because of what the fandom built on top of it. A big share are AU communities — Underfell, Underswap, Storyshift and the endless Sans variants — with their own lore rules, art and roleplay channels that assume you already know the source.

The rest stay closer to the game: pacifist and genocide route discussion, Deltarune chapter reactions now that the two run together, fangame and mod development servers, and speedrun channels comparing Sans fight attempts. Spoiler policy varies wildly, so check the rules if you have not finished either game.