Book of equilibrium

The Book of Equilibrium is a reward from The Void Stares Back. It gives players 50,000 experience to any combat skill above 75. Unlike xp lamps, it can be stored in the bank.

The book can be used on any of the following skills:
 * Attack
 * Strength
 * Defence
 * Magic
 * Ranged
 * Summoning
 * Prayer