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Adds an Ancient Library dungeon structure to Minecraft worlds. The rare stone-brick library contains bookshelves, lanterns, and trial spawners that unleash multiple waves of vanilla mobs. Defeating all waves causes the spawner to drop a Library Key. The key can be inserted into Library Vault blocks inside the structure, which reward the player with a randomly selected enchanted book — any vanilla enchantment is possible, with higher-level books being progressively rarer.