Shapechanger. The deep scion can use its action to polymorph
into a humanoid-piscine hybrid form, or back into its true form.
Its statistics, other than its speed, are the same in each form.
Any equipment it is wearing or carrying isn't transformed. The
deep scion reverts to its true form if it dies.
Amphibious (Hybrid Form Only). The deep scion can breathe
air and water.

[b]Shapechanger.[/b] The deep scion can use its action to polymorph
into a humanoid-piscine hybrid form, or back into its true form.
Its statistics, other than its speed, are the same in each form.
Any equipment it is wearing or carrying isn't transformed. The
deep scion reverts to its true form if it dies.
[b]Amphibious (Hybrid Form Only).[/b] The deep scion can breathe
air and water.

Actions

Multiattack. In humanoid form, the deep scion makes two melee attacks. In hybrid form, the deep scion makes three attacks: one with its bite and two with its claws.

Battleaxe (Humanoid Form Only). Melee Weapon Attack: +6 to
hit, reach 5ft., one target. Hit: 8 (1d8+4) slashing damage, or

9 (1d10+4) slashing damage if used with two hands.

Bite (Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach

5 ft., one creature. Hit: 6 (1d4+4) piercing damage.

Claw (Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5ft., one target. Hit: 7 (1d6+4) slashing damage.

Psychic Screech (Hybrid Form Only; Recharges after a Short
or Long Rest). The deep scion emits a terrible scream audible
within 300 feet. Creatures within 30 feet of the deep scion must
succeed on a DC 13 Wisdom saving throw or be stunned until
the end of the deep scion's next turn. In water, the psychic
screech also telepathically transmits the deep scion's memories of the last 24 hours to its master, regardless of distance, so long as it and its master are in the same body of water.

[b]Multiattack.[/b] In humanoid form, the deep scion makes two melee attacks. In hybrid form, the deep scion makes three attacks: one with its bite and two with its claws.

[b]Battleaxe (Humanoid Form Only).[/b] Melee Weapon Attack: [+6] to
hit, reach 5ft., one target. Hit: 8 ([1d8+4]) slashing damage, or
9 ([1d10+4]) slashing damage if used with two hands.

[b]Bite (Hybrid Form Only).[/b] Melee Weapon Attack: [+6] to hit, reach
5 ft., one creature. Hit: 6 ([1d4+4]) piercing damage.

[b]Claw (Hybrid Form Only).[/b] Melee Weapon Attack: [+6] to hit, reach 5ft., one target. Hit: 7 ([1d6+4]) slashing damage.

[b]Psychic Screech (Hybrid Form Only; Recharges after a Short
or Long Rest).[/b] The deep scion emits a terrible scream audible
within 300 feet. Creatures within 30 feet of the deep scion must
succeed on a DC 13 Wisdom saving throw or be stunned until
the end of the deep scion's next turn. In water, the psychic
screech also telepathically transmits the deep scion's memories of the last 24 hours to its master, regardless of distance, so long as it and its master are in the same body of water.

Details

Deep scions began life as people who were stolen from shore or saved from sinking ships and offered a terrible bargain by an undersea power: surrender, body and soul, or drown. Those who submit are subjected to an ancient ritual widespread among evil aquatic creatures.
Its methods are painful and the result never certain, but when it works, the magic transforms an air-breathing person into a shapechanger that can take a form that is
fully at home beneath the waves Deep scions began life as people who were stolen from shore or saved from sinking ships and offered a terrible bargain by an undersea power: surrender, body and soul, or drown. Those who submit are subjected to an ancient ritual widespread among evil aquatic creatures.
Its methods are painful and the result never certain, but when it works, the magic transforms an air-breathing person into a shapechanger that can take a form that is
fully at home beneath the waves

Source Volos Guid to Monsters, p.135

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