During a grueling battle, you have learned to transform pain and fatigue into new energy to fight harder than before.
When you reach half or less of your total hit points, you can choose to activate War Fury and gain the following benefits:

• Your weapon attacks score a critical hit on a roll of 19 or 20.
• You can use your bonus action to attack again after using your Extra Attack to hit an enemy, but you suffer a -4 penalty on the attack roll.