Minecraft wiki entry for Farming, associated text: Cleric Villagers can sell you Bottles o'Enchanting, providing a source of experience which can be stored and used at your leisure. They are expensive (3 emeralds apiece), but various crop farms (see below) can let you earn vast amounts of emeralds. Buying the bottles also grants the usual experience for trading. Each stack of 64 bottles offers an average of 448 experience, enough to elevate to level 18 from zero.