Siren

Medium Fey, Chaotic Good

AC: 14

Initiative: +4 (14)

HP: 38 (7d8 + 7)

Speed: 30 ft., swim 30 ft.

STR: 10 (+0)
DEX: 18 (+4)
CON: 12 (+1)
INT: 13 (+1)
WIS: 14 (+2)
CHA: 16 (+3)

Skills: Medicine +4, Nature +3, Stealth +6, Survival +4

Senses: darkvision 60 ft., Passive Perception 12

Languages: Common, Elvish, Sylvan

CR: 3 (XP 700; PB +2)

Amphibious.

Siren can breathe air and water.

Magic Resistance.

Siren has advantage on saving throws against spells and other magical effects.

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)

Actions

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.

Find this creature in the encounter builder

Source: Tales from the Yawning Portal, p. 243 - Licenses and attribution