Actions

Multiattack. The boxer makes four fisticuffs attacks or two fisticuff attacks and Brace Up.
  Fisticuffs. Melee Weapons Attack: +8 to hit, reach 5ft., one target. Hit: 1d10 + 5 bludgeoning damage.
  Brace Up. The boxer gains 14/25 temporary hit points.

Reactions

Cross Counter. When hit by a melee attack the boxer can use this reaction to reduce the damage taken by the attack by 1d10 + 10. If this reduces the damage to 0 or lower, the boxer may make a fisticuffs attack against the creature who made the attack if they are within range.