Hack is the quick opening skill with a Cutlass. This is the first combo skill.
To use this attack, pull out a cutlass form your weapon belt, and click one of the control keys or you left mouse button. If close enough to the enemy the pirate will do damage to the enemy. Forming combos gives more damage.
Increasing this ability increases the ammount of damage. This is replaces High Cut for a Sabre and Chop for a Broadsword.