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 the Worms and Man Eater. The Cobalt Shield grants the player knockback immunity.

The most player-induced knockback can currently be inflicted using the Thorns Potion, which has a knockback value of 10. This is followed immediately by the Enchanted Boomerang, Thorn Chakram, Flamarang, Hellfire Arrow, and Grenade, which all have a knockback value of 8.

Underground

 * Giant Worm
 * Devourer

Jungle

 * Snatcher

Underground Jungle

 * Man Eater

Dungeon

 * Dungeon Guardian

Underworld

 * Bone Serpent

Bosses

 * Eye of Cthulhu
 * Eater of Worlds
 * Skeletron

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