What does piercing 5 do in Minecraft?

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What does piercing 5 do in Minecraft?Armor piercing: with a max level of 5, this new piercing enchant will make you able to pierce through yours enemy’s armor, every enchant level will give you a 5% of armor piercing, which ignores the armor of the enemy you shoot at, example: a full diamond player has a complete armor bar (10 chestplates over their …