In Minecraft, piercing is an enchantment that can be applied to a crossbow. It allows arrows fired from a crossbow to pass through multiple entities, including mobs and shields. The number of entities that an arrow can pass through depends on the level of the piercing enchantment. There are four levels of piercing enchantment, with each level allowing the arrow to pass through one more entity than the previous level. For example, at level one, the arrow can pass through one entity and hit another, at level two, the arrow can pass through two entities and hit another, and so on. Piercing also allows players to have an infinite supply of arrows, as long as they can find where the arrow landed to pick it back up. However, arrows that end up in any other objects won’t be recoverable, so players need to have a downward trajectory in mind for arrow recovery. Piercing can be added to a crossbow using an enchanting table, combining enchanted crossbows with an anvil, or combining an enchanted book with a crossbow with an anvil.