Multiattack
The harpy makes two attacks: one with its claws and one with its club. Alternatively, it can do its Luring Song Ability once.
Claws
Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 2d4+1 slashing damage.
Club
Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 1d4+1 bludgeoning damage.
Luring Song
Every humanoid and giant within 300 ft. of the harpy must succeed on a DC 11 Wisdom Saving Throw or be charmed 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.
While charmed by the harpy, a target is incapacitated and ignores the songs of other harpies. If he charmed target is more than 5 ft. away from the harpy, the target must move on its turn toward the harpy by the most direct route. It doesn't avoid opportunity attacks, but before moving into damaging terrain, and whenever it takes daamge from a source other than the harpy, a target can repeat the Saving Throw. A creature can also repeat the Saving Throw at the end of each of its turns. A target that successfully saves is immune to this harpy's song for the next 24 hours.