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Knockback is an Enchantment added by Vanilla Minecraft. Knockback on Swords will send Mobs backwards and will send them further the higher the enchantment level is. Knockback cannot be applied in Survival mode on Bows as Punch is used in its place. It will increase with each Tier (basic is one block):
I: +1,5 blocks
II: +2,7 blocks
Without use of mods, Knockback II is the strongest knockback can become in Hexxit.