Spell Book
Spell book is an object, where heroes store their learned spells. Is is also needed to cast a spell. Any hero can have a spell book, but typically might heroes, like knights or beastmasters, do not have them at the beginning of custom scenarios. However, [alchemists]] and death knights do start with one. Spell books can be bought from a mage guild for 500 
.
A spell book cannot be traded to another hero, nor can it be lost after a defeat.