If not wearing heavy armor, you can enter a rage. You have a number of uses based on your Barbarian level, regaining one on a Short Rest and all on a Long Rest.
While raging, you gain:
• Advantage on Strength checks and saves.
• Bonus damage on Strength-based attacks (+2). This increases to +3 at 9th level, and +4 at 16th level.
• Resistance to bludgeoning, piercing, and slashing damage.
• You cannot cast or concentrate on spells.
Your rage lasts until the end of your next turn. It extends if you attack an enemy, force a save, or use a Bonus Action to continue it. It ends early if you are Incapacitated.