Buzz·Posted on Mar 30, 201710 Undertale AUs That Have Taken Over The FandomUndertale is a great game, with a fandom that as gone completely AU Crazy! Here is a list of some of the most prominent AUsby wiltingdaisyCommunity ContributorLinkFacebookPinterestTwitterMail 1. UnderFell 2. UnderSwap 3. Gaster Blaster!Sans (And Occasionally, Papyrus) 4. Gaster!Sans 5. YandereTale 6. MobTale (UTMob) 7. ErrorTale 8. Inktale 9. UnderFresh 10. Basically anything having to do with the origins and story of WD Gaster