A glossary of terms used in Borrowed Time.

• Fantasia: "Dreamland". A place that is not a place, that is real but is not real. The land of dreams and imagination, human or not.
• Fantasm: A fantasm is something made up of many intertwined possibilities, realities, existences, natures, et cetera, called "fantasmal fragments" or just "fragments". Fantasms embody many possible outcomes and have something resembling free will because of that. Once they make a choice, all of those fragments momentarily collapse into one. A fantasm's many fragments do not have to occupy the same space. Fantasms can have any number of these fragments, and this number can change. These fragments can take on many different forms and shapes.
  Fantasia itself is a fantasm. Most residents of Fantasia are also fantasms.
• Gargoyle: A fantasm consisting entirely of only one fragment. Gargoyles are typically built by fantasms, and tend to be robotic servants, made to serve a specific purpose, such as Mystery's surveyors.
• The Dream (outdated): The "dream" part of Fantasia, the "good" part.
• The Terror (outdated): The "nightmare" part of Fantasia, the "bad" part.

(Both still exist, sort of, they just aren't distinct or separate in any way.)

• Otherworld: A blistering white hot endless void within the Pinnacle of Creation, in Rust. Here, once the machine is built, the world, primarily minds, are melted down into energy enough to create a new world.