Minecraft wiki entry for Experience_farming, associated text: The first time the Ender Dragon is killed in a world, it yields a windfall of 12,000 experience points. In multi-player, this is more than enough to share among multiple players, but for a single-player, this poses a bit of a quandary. If swept up immediately, a single player can get up to level 68, which would allow 22 max-level enchantments done all at once. However, few players will have that many items ready to enchant, and anvil combinations can use up far more levels at a time. It may be worthwhile to take this in stages, picking up enough orbs to get past level 30, then immediately exiting the end to do one or two max-level enchantments and use the rest of the levels at the anvil. Then you can come back to the End to pick up more orbs, and quickly exit the End again to prolong the orbs' lifetime. Depending on your precision in collecting the orbs, this can allow perhaps 8 max-level enchantments, and a great deal of high-powered anvil work as well (letting you customize your new items and combine them with found books and items).