A nixie sings a magical melody. Every humanoid and giant within 300 feet of her that can hear her song must make a DC 13 Wisdom saving throw or be charmed until the song ends. The nixie must use a bonus action on her subsequent turns to continue singing. She can stop at any time. The song ends if the nixie is incapacitated. While charmed by the nixie, a target is incapacitated and ignores the songs of other nixies. If the charmed target is more than five feet away from the nixie, the target must move on its turn toward her by the most direct route, trying to get within five feet. It doesn't avoid opportunity attacks, but before moving into damaging terrain such as lava or a pit, and whenever it takes damage from a source other than the nixie, the target can repeat the saving throw. A charmed target can also repeat the saving throw at the end of each of its turns. If the saving throw is successful, the effect ends. A target that successful saves is immune to the nixie's song for the next 24 hours.