Talk:Delta Rune/@comment-36357429-20181104131622/@comment-37355644-20181111222850

Toby Fox does not determine what an AU is. An AU is when its the same world as in the original universe, but something has been altered to make the situation of the present era different. For example, if a situation was presented where dinosaurs had not gone extinct on Earth by 2018, that would be an AU. In this case, monsters are on the surface rather than underground at around the same time as the events of Undertale occurred in the original universe (this is proven by characters who were in Undertale (Undyne, Alphys etc.) being alive at the time of Deltarune's events occurring). If Toby Fox says that Deltarune is not an AU, he's completely contradicting what an AU is. Therefore, in this case, a source is unnecessary, because we already know what an AU is and Deltarune is almost certainly an AU unless future events prove otherwise, despite how unlikely that is at this point.