You can attack twice instead of once whenever you take the Attack action on your turn.

When you take the Attack action on your turn and attack with a weapon that has a mastery property, you can use a different mastery property from the same weapon during that turn, provided you have the required weapon mastery.

You have a limited well of physical and mental stamina that you can draw on. You can expend uses to regain hit points, take the Dash action as a Bonus Action, or stand from the Prone condition as a Bonus Action. You have three uses, regained after a Short or Long Rest. When you regain hit points with this feature, you regain 1d10 plus 10 hit points.

When a creature misses you with a melee attack, use your Reaction to make a melee weapon attack against it and add a Superiority Die to the damage if it hits.

Use your Reaction to reduce the damage of a melee attack by the roll of a Superiority Die plus your Dexterity modifier.

Add a Superiority Die to the attack roll after seeing the roll but before knowing whether it hits.

Add a Superiority Die to the damage roll and force the target to make a Wisdom saving throw or become Frightened until the end of your next turn.

When you hit a creature with a weapon attack, expend a die to damage another creature within your weapon's reach and adjacent to the original target.

When you hit with a weapon attack, add a Superiority Die to the damage and push the target up to 15 feet away if it fails a Strength saving throw.

When you hit with a weapon attack, add a Superiority Die to the damage and force the target to drop one held object if it fails a Strength saving throw.

Choose the Great Weapon Fighting style. When you roll a 1 or 2 on a damage die for an attack made with a Melee weapon that has the Two-Handed or Versatile property, you can reroll the die, and you must use the new roll. You can use this benefit only once per die.

You gain mastery with six weapons of your choice. You can use the mastery properties of those weapons. Chosen weapons include the greatsword, longsword, maul, handaxe, javelin, and heavy crossbow.

You can take one additional action on your turn, except a Magic action. Once you use this feature, you cannot use it again until a Short or Long Rest. Beginning at level 5, you can use it twice before a rest, but only once on a turn.

When you fail an ability check using one of the skills you have proficiency in, you can expend one use of Second Wind to add 1d10 to the check, potentially turning the failure into a success.

You learn Combat Superiority maneuvers and gain four d8 Superiority Dice. You regain all expended dice after a Short or Long Rest. Your Battle Master maneuvers include Precision Attack, Menacing Attack, Riposte, Sweeping Attack, Pushing Attack, Disarming Attack, and Parry.

When you finish a Short or Long Rest, you can choose three different skills or tools. You gain proficiency in them until you use this feature again.

You gain the Great Weapon Master feat.

Immediately after you use Second Wind, you can move up to half your Speed without provoking Opportunity Attacks.

You gain the Resilient feat, choosing Constitution. Your Constitution score increases by 1, and you gain proficiency in Constitution saving throws.

You learn two additional Battle Master maneuvers and gain two additional Superiority Dice, which are d10s. You now have six Superiority Dice.

You gain the Polearm Master feat. Although Mtembe usually fights with his father's greatsword, this training represents his mastery of reach weapons and battlefield spacing.

You can reroll a failed saving throw. If you do so, you must use the new roll. You can use this feature once and regain the ability after a Long Rest. You can use it twice between Long Rests starting at level 13.

You learn two additional Battle Master maneuvers. Your Superiority Dice are d10s, and you have six of them.

You retain your military rank and can invoke the authority of your former service to influence soldiers and other members of military organizations. You can usually secure simple lodging, food, or aid from sympathetic military personnel, though they will not risk their lives or violate orders for you.