Cursed Merfolk Queen

Undead Nature. The Cursed Merfolk Queen doesn’t require air, food, drink, or sleep.

Undead Fortitude. If damage reduces the Cursed Merfolk Queen to 0 hit points, she must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, she drops to 1 hit point instead.

Turning Defiance. The Cursed Merfolk Queen has advantage on saving throws against effects that turn undead.

Multiattack. The Cursed Merfolk Queen makes two melee attacks and uses her Frightening Scream or Paralyzing Gaze.

Tentacle. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage, and the target is grappled (escape DC 15) if it is a Medium or smaller creature. Until the grapple ends, the Cursed Merfolk Queen can’t use this tentacle on another target. She has eight tentacles but can only grapple up to four creatures at once.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage.

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) slashing damage.

Frightening Scream (recharge 5-6).  The Cursed Merfolk Queen lets out a horrific wail.  All creatures within 30 feet of her must succeed on a DC 15 Wisdom saving throw or become frightened of her for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.  If the Cursed Merfolk Queen is submerged underwater, she may still use this ability as a frightening aura. 

Paralyzing Gaze.  The Cursed Merfolk Queen fixes her gaze on one creature she can see within 10 feet of her. The target must succeed on a DC 15 Wisdom saving throw against this magic or become paralyzed for 1 minute. The paralyzed target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target’s saving throw is successful or the effect ends for it, the target is immune to her gaze for the next 24 hours.