Spellbook

Description
The Spellbook offers permanent upgrades in exchange for various Runes. You must unlock each of its 4 pages individually by reaching certain Devourer levels.

Spell Book Pages
There are four pages in total.
 * Page 1 can be unlocked at Devourer Level 13
 * Page 2 can be unlocked at Devourer Level 25
 * Page 3 can be unlocked at Devourer Level 38
 * Page 4 can be unlocked at Devourer Level 58