Sword
From King Arthur's Gold Wiki
This page is not up-to-date.
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 full, it will kill any unshielded opponent in one blow.
A charged sword strike will also cause a shielded knight to become vulnerable for a moment ("stun"), similar to how they become vulnerable when hit by a fully charged arrow.
Using the sword knights can destroy every block except stone and bedrock however the digging speed of a knight is inferior to that of a builder.