Limited Amphibious: can breathe both air and water, however must return to the Sea once per 'day’ for at least an hour or begin suffocating.

Fey Ancestry: Immune to magical sleep, Advantage to saves on charm effects.

Glamour: Effects those under the Siren’s Song or initial contact. The Siren appears to be a beautiful Elven Mermaid unless those that see her pass a DC 16 Wisdom Check. Passing the check allows the creature to see passed the Glamour effect. Is not active while creature is attacking or aggressive

Sonar: Being Deafened causes creatures blindsight range to be cut in half while within water, to 10ft while on land.

Abyssal Sea Mastery: While submerged within the Abyssal Sea, this creature cannot be attacked by non magical sea creatures, and can communicate with said sea creatures through crude psionics. Also gains Advantage on Stealth Checks as well as Survival Checks for tracking while submerged.

Multi-attack.  Attacks with two Claws, followed by either a Bite or Tail Slap.

Claw. Melee Weapon Attack: +7 to hit. Hit: 8 (1d6 + 4)

Bite. Melee Weapon Attack: +7 to hit. Hit: 11 (1d10 + 4)

Tail Slap. Melee Weapon Attack:  Reach 10ft, +7 to hit. Hit: 9 (1d8 + 4)

Echo Blast. Ranged Spell Attack: Range 60ft, +6 to hit. Hit: 13 (2d8 + 3)

Siren's Song. Creature will begin to sing in Deep Elven infusing the song with its Psionic Abilities. Creatures who can hear the song must make a DC 16 Charisma Saving Throw, upon a failure one of 3 effects may be chosen to be imposed upon the target:

• Come Hither…: Target is compelled to approach the Siren, it must use its entire turn to move closer to her.

• Fight for Me…: Target is compelled to move and attack the closest ally, it must do so on its turn.

• Leave Me…: Target is compelled to move away from the Siren as if under a fear effect, it must spend its turn moving away from her, even if such a move would put them in danger.

Targets get a chance to save from the effects at the end of each turn, as long as the Siren is still singing. The Siren must use its bonus action to concentrate on the song each turn, it may still move and attack while singing. Targets under the effects of the siren are considered helpless, when making attack rolls against them is concerned.

Improved Defensive Scramble. When an attacker within 60ft makes an attack against this creature, it must make DC 16 Wisdom save. if it fails disadvantage on all attack rolls until the save is made, the triggering attack also fails to hit. Creatures Immune to Psychic damage are immune to this ability.