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The Library is a building within the Graveyard, where minions can be assigned to study ancient books. Assigning minions to this building grants the player 40 experience and 8% of the experience from the current level per minion after a victory, except for quest battles. The amount of experience gained decreases with increasing difficulty levels with 40 plus 8% being the amount for the Cakewalk difficulty.

The Library is unlocked by sacrificing a Dark Knight and 25 Diggers' Souls. Extra minion slots can be unlocked by sacrificing a Lich, a Bone Golem, and a Vampire. You can sacrifice these minions in any order, and it will cost 40 Souls for the second upgrade, 60 for the third, and 80 for the fourth and final upgrade.

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