Arcane spell casters record the spells they know in a spell book.

A character’s spell book contains exactly the number of spells they are capable of memorising (as determined by the character’s class and level).

Arcane spell casters begin play with as many spells in their spell book as they are able to memorise. The referee may choose these spells or may allow the player to select.

When the number of spells an arcane spell caster can memorise increases (i.e. when gaining an experience level), they can add new spells to their spell book. In this way, the number of spells in the spell book is brought in line with the number of spells the character can memorise. This is possible in two ways:

• Mentoring: The character can consult an arcane guild or mentor to learn new spells. This process takes about a week of game time. The spells a character learns in this way are determined by the referee, who may let the player choose.
• Research: It is also possible to add more spells to a spell book by means of magical research.

An arcane spell caster can rewrite spells if their spell book is lost or destroyed.
Cost: The cost per spell to be recovered is 1 week of game time per level of the spell and 1,000gp per level of the spell—e.g. rewriting one 1st level spell and one 2nd level spell takes 3 weeks and 3,000gp.
Sole activity: Rewriting Spell Books requires complete focus. The character cannot do anything else during this period.

Without the use of magic (e.g. Read Magic), a spell book can only be read by its owner.