Allows for you to attack with your off-handed weapon, letting you duel wield weapons.
Allows for you to use the Axe/Sword you put in on your off-hand slot by right clicking. This allows for interesting combos with the following:
Axe & Sword - Axe & Axe - Sword & Sword - Axe & Trident - Sword & Shield - More!
The default cooldown for off-hand swinging is higher than the weapon's attack speed for balance purposes, however this can be modified with the following gamerules:
/gamerule duelWieldSwordCooldown <value>
/gamerule duelWieldAxeCooldown <value>
The default value for Axe is 100 and for Sword it is 30, lowering the value will speed up the attack speed, and increasing the value will slow down the attack speed.
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