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Fabric *.21.4 mod adding a Villager Book Reroller wand. Right-click a librarian villager with it to open a chest-***** GUI: pick a target enchantment (Mending, Unbreaking, Efficiency, etc.) and max emerald price, then hit Activate. The mod periodically checks the villager's trades — if no matching enchanted book at or below your price exists, it clears the trades and breaks/replaces the nearby lectern to force a reroll, repeating automatically until a matching book trade appears.