Ars Arcanum (Latin for "The Art of Mystery") is a glossary or appendix section at the end of the books that are part of the Cosmere universe. The information is presented from an in-universe perspective.
Ars Arcanum in each book or series
All of the cosmere stories containing an Ars Arcanum are listed here in rough chronological order.
The books in the Mistborn series each have an Ars Arcanum with the table of Metallic Arts, describing what each of the Allomantic metals does. Since more metals are discovered and new things about them are learned, the table in each later book has more metals and information with greater accuracy.
The Stormlight Archive
- In who's voice is the Ars Acranum written?
— Theoryland - 2011-11-11
- Arcanum Unbounded - The Rosharan System
- Who's the Ardent sketching bridgemen?
— Theoryland - Mar 20th, 2014