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- Unenchanted item: Applies at least one random enchantment, using the vanilla enchantment table algorithms.
- Book: Applies exactly one random enchantment, using the vanilla enchantment table algorithms.
- Empty Bottle: Fills the bottle into a Bottle O' Enchanting
- Enchanted item: Attempts to re-enchant the item. Re-enchanting may fail if the random number generator attempts to add enchantments the item already has. Re-enchanting gets more expensive with the number of enchantments already present.
The cost is determined with the following equation (except books, which are always 250):
(<TargetLevel> + (<TargetLevel> / 7.5) ^ 4 * 10 * <EnchantmentMultiplier>);
EnchantmentMultiplier is defined as the following:
(<EnchantmentCount> + 1.0) ^ 2;
EnchantmentCount is the number of enchantments currently on the item.
The result of this equation is the 'work' value that the Auto-Enchanter must complete to enchant the item. Each unit of work draws 16MJ and 4mB of mob essence.