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Guardians also have a thorn-like effect which inflicts 2 damage when the guardian's spikes are out.
Thorns applies a durability penalty to the armor. It reduces durability by an additional 3 points when inflicting damage. If multiple armor pieces are enchanted with Thorns, then each piece separately inflicts damage on the attacker, and the Thorns durability penalties are applied to each piece individually.
Using commands, the enchantment level can be increased. The maximum possible chance of dealing damage is 100% (at level 7). If the level of Thorns exceeds 10, then it deals
Level - 10 damage.
Thorns I and II can be obtained naturally from drops or by combining the enchantment from a book. Thorns III can be obtained only by using an anvil to combine two Thorns II enchantments, or by combining the enchantment from a book obtained via trading with a villager.
Thorns can be applied to a non-armor item only by using commands or a third-party tool. When such an item is held in either hand, an attacker suffers damage according to the formula above but with no durability penalty.