One-armed: Ereviar may not use two-handed weapons, versatile weapons, or shields, and has disadvantage on strength checks which require the use of his arm.
Multiattack: Ereviar makes two attack with his falchion and may add one of his maneuvers to either attack.
Falchion: melee weapon attack, reach 5 ft, +7 to hit, 1d6+4 slashing damage.