Booko

Booko was a character from "The Lich." He appeared as a hologram through the Enchiridion, where he explains the functionality of the book's power:

“Hello, my name is Booko! What you see here is a map of the multiverse! It shows all the known dimensions and the links between each of them. This is the dimension that contains the universe in which we currently reside. At the center of the multiverse is a dimension called the Time Room, believed to be the quasi-corporeal dwelling place of the almighty Prismo. The Time Room is the single dimension that exists outside of time. The Time Room produces time waves that are experienced by other dimensions. Some dimensions have permanent links that allow travel to and fro. Others become linked temporarily by naturally forming Worm Holes. And others can become linked artificially by magical portals, torn open by items of great power. Once the last gem is inserted into the Enchiridion it will have the power to create a portal to any dimension in the multiverse. An activated portal creates a time dilation in which either end of the portal experiences a temporal synchronization allowing for the safe passage of particles through a non-local region of spacetime.”