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Story
In this Undertale fan-game The human has done 673 genocide routes. The human started another... But something changed. Toriel saw The human kill some monsters and left them at the pillar as normal. Instead of making pie, she told sans' about the humans actions and how she saw them kill those couple monsters. Sans knew if he didn't do something he would die along with all the other monster's... including papyrus. Sans locked papyrus in the house and took his spare key, then went back to the door and asked Toriel to let him in. Toriel knew that she may be remembered as former queen and made up a stupid excuse. Sans' took a shortcut inside and said he didn't care that she was the former queen and that all that mattered was stopping the human. Meanwhile the human started walking down the corridor to Snowdin knowing that there was something off since they got no pie and haven't met up with Toriel yet. They turned the last corner to the exit of the ruins and saw sans' and Toriel standing there. They knew that the reset must of screwed up something in the timeline and attempted another, but Sans' destroyed the button... and the fight began.
Credits
Phase one theme - Calavern R Torielvania - (Heartache/Megalovania Remix) - YouTube
Phase 2A theme - Elver SwapSwap - Flatulence - YouTube
Phase 2B theme - Robin Blend - Dynami [Original] - YouTube
Phase 2C theme - MULTI BGM studio - https://youtu.be/riihm_N6bf0