You have learnt to overexert yourself and bring out greater power in your attacks.

• After you hit an enemy with an attack roll, you can sacrifice some of your remaining hit points to increase your attack's damage.
• The maximum number of hit points you can sacrifice is equal to twice your level.
• For every two hit points sacrificed, your weapon damage is increased by one.
• You cannot sacrifice hit points if it would bring you to zero or lower hit points.