Alluring Song
As an action, selkies can sing a magical melody to lure creatures to them. Every humanoid, beast, and giant within 300 feet of the selkie that can hear the song must succeed on a Wisdom saving throw or be charmed until the song ends. The DC of this saving throw is Charisma based.
The selkie must take a bonus action on its subsequent turns to continue singing. It can stop singing at any time. The song ends if the selkie is incapacitated.
While charmed by the selkie, a target is incapacitated and ignores the songs of other selkies. If the charmed target is more than 5 feet away from the selkie, the target must move on its turn toward the selkie by the most direct route. It doesn't avoid opportunity attacks, but it will navigate around difficult or damaging terrain if possible. Before moving into damaging terrain, such as lava or a pit, a target can repeat the saving throw. A creature can also repeat the saving throw at the end of each of its turns. The effect ends if the creature's saving throw is successful or if the selkie or their companions do anything harmful to it.
A target that successfully saves is immune to the selkie's song for the next 24 hours. When the effect ends, the creature knows it was charmed by the selkie.