Transcendence

This AU is a 'what-if' fan-fiction. Each story takes place after the episode Little Gift Shop of Horrors.

In summary, Bill Cipherdies due to the Transcendence, an event that makes paranormal activity common around the globe. Before he completely goes, he leaves behind a small part of himself in Dipper Pines.

This Tumblr blog explains this AU more in-depth.