Knockback

Knockback is a basic mechanic in Terraria, whereby players and enemies are repelled in the opposite direction of an attack. Most weapons and environment objects that cause damage also cause knockback, to varying degrees. Some enemies are immune to knockback, particularly Bosses and other enemies that travel through blocks, like Worms and Man Eater. Some enemies also have varying degrees of knockback resistance.

Equipping any Shield will grant the player knockback immunity.

The most player-inflicted knockback comes from the Thorns Potion, which has a knockback value of 10. This is followed immediately by the Paladin's Hammer with a knockback value of 9, then the Enchanted Boomerang, Flamarang, Thorn Chakram, Light Disc, Hellfire Arrow, Grenade and Breaker Blade, which all have knockback values of 8 each.

Various modifiers, and the Titan Glove accessory, can increase player-inflicted knockback.

Immune enemies
Other:
 * All Bosses except Brain of Cthulhu in its second phase, and Golem's Fists.
 * All Plants except Angry Trapper
 * All Worms (Not including the critter Worm)
 * Antlion
 * Blazing Wheel
 * Dungeon Guardian
 * Lihzahrd (2nd form)
 * Paladin
 * Pirate Captain
 * Spike Ball
 * Headless Horseman

History

 * 1.0.6: The Cursed Skull is no longer immune to knockback.

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