It was Genocide run, you killed everyone, Papyrus, Undyne, Alphys, Toriel... You then meet Sans in Last Corridor as fight begins...

After a long battle, Sans dodged your final attack as bone impaled you from the ground, resulting in Game over cus you had 1 HP, your Soul appeared infront of your Chest As Sans grabbed your Soul as he changed your Soul color to Blue with his Blue magic... As your Soul hovered over his hand as Cyan Cracks goes down your Soul as Sans's right eye socket flames with blue color, his left eye socket was empty, as your Soul flames with cyan color from his Blue Magic... As your Soul finally shatters into blue shards...

GAME OVER

“Getttt... Dunked one, Kid... If we are really friends, you wouldn't come back... At least not in Genocide Timeline”

CONTINUE RESET