The Transcendence AU is a massive fan universe based off of the Disney series Gravity Falls. This is a constantly growing universe, with many people adding their ideas and helping to expand it.
Most of the plot takes place after a major event known as the Transcendence, which brought the magical properties of Gravity Falls to the rest of the world. Dipper Pines now lives the immortal life of a demon as a result of fusing with Bill Cipher during this event. He retains his human form, but only exists within the Mindscape until he gains enough power to enter the physical plane. Many more additions to the world of this AU have been made as well. Several Sub-AUs of the Transcendence AU have also been created.
The Transcendence AU is huge, and there's a lot of stuff to be done! You can start by checking out the list of "stubs" (short articles that need to be expanded on) and the list of articles that need work.
There are also a lot of subjects that haven't been written about yet! You can check out the list of wanted pages to see what articles are being linked to that don't exist yet. Additionally, if you know about a topic and an article doesn't exist for it, feel free to go ahead and create it!
We have a style guide that describes how articles on the wiki should look. While you should familiarize yourself with it, don't stress out over conforming to it! It's better to have messy articles than no articles at all, since anyone can clean up an article once it exists.