Sword

A sword being swung by a knight

The sword is the knight's weapon of choice.

Use it with left click. Short presses will result in little stabs which are good for killing builders and archers. Holding down left mouse button will charge the sword. By releasing it while the meter is in the red, it will kill any unshielded opponent in one blow.

You can also use the fully charged attacks to dig or destroy blocks and constructions. A charged sword strike will also cause a shielded knight to become vulnerable for a moment, similar to how they become vulnerable when hit by a fully charged arrow.