Contubernium

Brave. The legionnaires has advantage on saving throws against being frightened.

Multiattack. The Century makes 10 melee attacks.

Gladius. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Leadership (Recharges after a Short or Long Rest). For 1 minute, the Legionnaires can utter a special command or warning whenever a nonhostile creature that it can see within 30 feet of it makes an attack roll or a saving throw. The creature can add  2d8 to its roll provided it can hear and understand the legionnaire. A creature can benefit from only one Leadership die at a time. This effect ends if the legionnaire is incapacitated.

Shield Wall. The contubernium adds 2 to its AC against one melee attack that would hit it. To do so, the legionnaires must see the attacker and be wielding a melee weapon.