Bill Cipher

Prompt

Bill is happy that Ford's mind is a "perfect, calm, orderly void" (a bleak white landscape) with a single wooden door. When Bill opens it, he is greeted by Stan playing paddleball inside the Mystery Shack. Stan reveals that while the demon was chasing Dipper and Mabel, he and Ford swapped clothes and pretended to be each other so Bill wouldn't suspect anything. Upon realizing this, Bill angrily reneges on the deal, implying that he intends to kill both Stan and the kids to demoralize Ford and force him into his mind.However, anticipating that Bill will deceive them, Ford takes out the Memory Gun, setting it to completely erase Stan's memory.In the mindscape,the door closes and the room is engulfed in blue flames due to the Memory Gun's effects.Stan explains that Bill is about to be erased forever, but the demon counters by asking Stan if he realizes that his mind is being erased as well. Bill attempts to escape and resorts to bargaining with Stan, but Stan refuses to listen as he has had enough of Bill's actions.Stan tells him that while Bill may be a really smart guy, he made one fatal mistake he should never have made: getting involved with Stan's family.Bill refuses to agree, claiming that Stan is making a big mistake and that he will give him whatever he wants until his form becomes severely distorted as he speaks the messages backwards (translated as: A-x-o-l-o-t-l - It is my time to burn, I call upon the ancient power that I can bring back) and tries to get through to Stan.Unfazed,Stan punches the weakened Bill,shattering the demon into pieces as Stan's memory is completely erased.With Bill dead, everyone who was trapped is freed when the tapestries are cut.Outside Fearamid, Bill's cronies are sucked back into the rift,with a disassembling Fearamid not far behind.The rift itself then seals and explodes in a massive shockwave,returning Gravity Falls to its former glory.The only thing left of Weirdmageddon is Bill's permanently petrified physical form.