Spellbook-type objects have four values.
- Spell Taught: This value determines which spell this spellbook will teach to those who read it.
- Training Gain: This value determines what percentage this spellbook will raise, each time it is read, its readers' adeptness at its spell (see above) up to a certain limit (see below).
- Training Limit: This value determines what maximum percentage this spellbook may raise its readers' adeptness at its spell (see above).
