Amphibious. Siren can breathe air and water.
Innate Spellcasting. Siren’s innate spellcasting ability is Charisma (spell save DC 13). She can innately cast the following spells, requiring no material components:
1/day each: charm person, fog cloud, greater invisibility, polymorph (self only)
Magic Resistance. Siren has advantage on saving throws against spells and other magical effects.
Shortsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.
Stupefying Touch. Siren touches one creature she can see within 5 feet of her. The creature must succeed on a DC 13 Intelligence saving throw or take 13 (3d6 + 3) psychic damage and be stunned until the start of Siren’s next turn.