An estimated Timeline for Glitchtale
Pre-Human Monster War:
- Copper and Agate Lightvale are born
- Asgore befriends Shane Goldburn and Roy Goldburn
- An unknown event occurs where Asgore loses his friendship with the Goldburns.
The Great Human and Monster war happens.
The seven human wizards meet, and seal the monsters underground.
Post-Human Monster War
- Amber is born
- Copper and Agate become rulers of the kingdom
- Copper and Agate have an argument which leads to Agate leaving the kingdom
- Copper and Agate battle again, this time Agate is victorious.
- Agate creates Bete Noire before dying.
Unknown time prior to Glitchtale:
- Asgore kills 5 humans in the time he has been trapped underground.
20 Years Prior to Glitchtale:
- The soul of Integrity falls into the underground, and is killed by Asgore.
- Flowey gets a hold of the 6 Human’s determination and tries to commit genocide on monster-kind, only to be continually stopped by Sans.
Sometime after this:
- Frisk falls to the underground, and completes at least 2 Pacifist timelines.
The Events of Glitchtale follow promptly afterwards.