Sure-Footed. The Boxer has advantage on Strength and Dexterity saving throws made against effects that would knock it prone.
Last stand. When the Boxer takes fatal damage the first time in combat the Boxer must make a Constitution saving throw with a DC of 10 if it succeeds gain 1 hit point.
Multiattack. Boxer makes two melee attacks, one with its Left hook and one with its Right hook
Left hook. Melee Attack: +3 to hit, reach 5 ft., one creature. Hit: 2 (1d4-1) bludgeoning damage.
Right hook . Melee Attack +3 to hit, reach ft ft., one creature. Hit: 3(1d6-1) bludgeoning damage
Upper cut. Melee Attack: +4 to hit, reach 5 ft., one creature. Hit: 5(1d8) bludgeoning damage, and the target must succeed on a DC 10 Constitution saving throw or be knocked prone.