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Medium monstrosity, chaotic evil
Multiattack. The harpy makes two attacks: one with its claws and one with its club.
Claws. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 6 (2d4 + 1) slashing damage.
Club. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) bludgeoning damage.
Luring Song. The harpy sings a magical melody. Every humanoid and giant within 300 feet of the harpy that can hear the song 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.
Taking glee in suffering and death, the sadistic harpy is always on the hunt for prey. Its sweet song has lured countless adventurers to their deaths, drawing them in close for the harpy to kill and then consume.
Divine Curse. Long ago, an elf wandering a forest heard birdsong so pure and wholesome that she was moved to tears. Following the music, she came upon a clearing where stood a handsome elf youth who had also paused to hear the bird's song. This was Fenmarel Mestarine, a reclusive elf god. His divine presence stole her heart as he fled, vanishing into the woods as if he was never there.
Harpy Song. To hear a harpy's song is to hear music more beautiful than anything else in the world. A traveler that succumbs to the entrancing effect of that singing is compelled to blunder toward its source. A harpy sometimes charms victims before it attacks, but a more effective use of its song is to lure prey over cliffs, into bogs and quicksand, or into deadly pits. Creatures trapped or incapacitated then become easy targets for the harpy's wrath.
Sadistic Cowards. Harpies haunt bleak coastal cliffs and other places hazardous to non-flying creatures. Harpies have no interest in a fair fight, and they never attack unless they have a clear advantage. If a fight turns against a harpy, it lacks the cunning to adapt and will flee and go hungry rather than risk straight-up combat.
Gruesome Collectors. Harpies take shiny baubles, valuable objects, and other trophies from their victims, sometimes fighting with each other for the right to claim the choicest prizes. When no valuable objects can be found, a harpy takes hair, bones, or body parts to line its nest. A harpy's lair is usually hidden in remote ruins, where adventurers can discover valuable treasure and magic hidden beneath foul piles of offal.