Glossary

Otherwise known as the Grand Finale, the End of All Things is exactly what it sounds like: the end of everything, including Ouroboros itself. 

This term was privately coined (and strictly used internally) by Moirorn, who may be the only Universe-born entity aware of its evitability. Certain Unknown, such as the Astral Artist, Ouroboros, and the Trickster, are also au courant, though they have not personally named the event. (Well, the Trickster may or may not refer to it as "Good Riddance".)