Dark Waters Run Deep

When you cast this spell, an eerie darkness spreads across a 150-foot cube centered on you. From above, dim light shines down, shimmering as if rays of light were being refracted through a surface of water. Soon after, spectral water fills the cube, and you, as well as everything you're wearing or carrying, transform into a Kraken. Within the cube, creatures cannot breathe or speak, and the area around them is difficult terrain. You can designate any number of creatures to not be affected by this.

You gain its statistics, retaining your alignment and Intelligence, Wisdom, and Charisma scores. You also retain all of your proficiencies, in addition to gaining those of the creature. If the creature has the same proficiency as you but higher than yours, use the creature's bonus in place of yours. You assume the hit points and Hit Dice of the kraken. When you revert to your normal form once the spell ends, you return to the number of hit points you had before you transformed. If you revert as a result of dropping to 0 hit points, any excess damage from the finishing blow carries over to your normal form. As long as the excess damage does not reduce your normal hit point total to 0, you are not rendered unconscious.

You have no regional effects or lair actions of the kraken, but you can use its written legendary actions. Additionally, you have the Legendary Resistance trait (if you fail a saving throw, you can choose to automatically succeed.) and can use it up to three times while the spell lasts.