Martial Prowess. When the champion hits with a melee weapon, the weapon deals an extra 2 damage (included in the attack).  

---

  While following the command of a captain, the champion gains additional abilities based on the captain's level:   2nd. Ability Score Increase. The champion's Strength, Dexterity, or Constitution score increases by 2, to a maximum of 20.   6th. Second Wind (Recharges after a Short or Long Rest). On its turn, the champion can use a bonus action to regain hit points equal to 1d10 + the captain's level.   10th. Ability Score Increase. The champion's Strength, Dexterity, or Constitution score increases by 2, to a maximum of 20.   14th. Deadly Accuracy. The champion's weapon attack rolls score a critical hit on a roll of 19 or 20.   18th. Martial Advantage (1/Turn). The champion can deal an extra 7 (2d6) damage to a creature it hits with a weapon attack if that creature is within 5 feet of an a lly of the champion that isn't incapacitated.