Baronness Erryn Coralsong

Amphibious. Erryn can breath air and water.

Emissary of the Sea. Erryn can communicate simple ideas to beasts that can breathe water. They understand the meaning of her words, though she has no special ability to understand them in return.

Guardian of the Depths. Erryn is resistant to cold damage and ignores any of the drawbacks caused by a deep, underwater environment.

Innate Spellcasting. Erryn innate spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). She can innately cast the following spells, requiring no verbal or material components:

1/day each: fog cloud, gust of wind, wall of water, conjure animals (water animals only).

Spellcasting. Erryn is a 5th-level spellcaster. Her spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). She knows the following spells:

Cantrips (at will): booming blade, mage hand, dancing lights, prestidigitation, ray of frost

1st level (4 slots): expeditious retreat, ice knife,* magic missile, shield

2nd level (3 slots): blur, aid

3rd level (2 slots): sleet storm

Coralsong Trident. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage. 

Booming Blade. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage plus an additional 4 (1d8) thunder damage. On a hit the target is sheathed in booming energy until the start of Erryn's next turn, if the target willingly moves before then it immediately takes 9 (2d8) thunder damage and the spell ends.

Ray of Frost. Ranged Spell Attack: +5 to hit, range 60 ft., one target. Hit: 9 (2d8) cold damage and the target's speed is reduced by 10 ft until the start of Erryn's next turn.