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HappyTale is what remains of Error!Sans's AU after he destroyed it. Eventually, CORE!Frisk managed to slightly restore it to it's former state, and Ink!Sans restored life to it. Error!Sans eventually found this AU while it was being restored, and attacked it. During the battle, the AU disappeared, and was never found by either Ink!Sans or Error!Sans again. It now resides in the Rho Exclusion Zone, as Rhosaith had captured the AU during the battle.