Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Claws. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 6 (2d4 + 1) slashing damage.

Fearful Song. The harpy sings a magical haunting melody. Every humanoid and giant within 300 feet of the harpy that can hear the song must succeed on a DC 12 Wisdom saving throw or be frightened until the song ends. The harpy must take a bonus action on its subsequent turns to continue singing. It can stop singing at any time. The song ends if the harpy is incapacitated.

A target that successfully saves is immune to this harpy's song for the next 24 hours.