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. The Cobalt Shield grants knockback immunity to the player.

The most player-induced knockback can currently be inflicted using the Thorns Potion. This is followed immediately by the Enchanted Boomerang, Thorn Chakrum, Flamarang, Hellfire Arrow, and Grenade, which all have the same degree of knockback.