Ancients Awakened/Aleister Book

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Aleister Book is a Hardmode tier Expert Mode-exclusive accessory that is obtained from the Treasure Bags when opened in Hardmode. When equipped, it increases your minion damage by 10% and grants +2 minion slots. After killing certain bosses, the buffs granted become stronger.

Trivia

 * This, along with, are the only accessories obtainable from developer bags, and can be upgraded into EX variants.
 * The bosses required to empower the book are unknown.