Spell book is an object where heroes store their learned spells. It is also needed to cast a spell. Any hero can have a spell book, but typically might heroes (e.g. Knights or Beastmasters) do not have them at the beginning of custom scenarios; however, Alchemists and Death Knights do both start with a spell book. Spell books can be bought from a mage guild for 500 or obtained by equipping Titan's Thunder combination artifact. A spell book cannot be traded to another hero, nor can it be lost after a defeat.