From The Heroes of Might and Magic III wiki

A place to record learned Spells.

A hero cannot cast a spell unless it is in his spell book.

A hero without a spell book can buy one at a Mage Guild for 500 gold.

A spell book cannot be traded to another hero, nor can it be lost after a defeat.

The Might oriented heroes do not usually start with a spell book. The exceptions are Alchemists and Death Knights.

[edit] Related topics

• Scholar
• Spell Scroll
• Spell list (sorted by name)
• Spell list (sorted by type and level)