Leviathan

Your Proficiency Bonus

Large, Huge (Requires Druid Level 10+), or Gargantuan (Requires Druid Level 14+)

10 + your Wisdom Modifier

2 times your Druid level

Your Strength and Dexterity scores are equal to your Wisdom score in this form.

Your Constitution, Intelligence, Wisdom, and Charisma don't change.

You can breathe air and water.

Constitution Saving Throw: DC equals your spell save DC, each creature of your choice that starts its turn in a 10-foot Emanation originating from you. Failure: 2d4 Poison damage, and the target has the Poisoned condition until the start of its next turn.

You make two Rend attacks.

Melee Attack Roll: Bonus equals your spell attack modifier, reach 10 ft. Hit: 1d8 plus your Wisdom modifier Bludgeoning damage.

Trigger: You take damage. Response: You expend a level 1+ spell slot and release an inky cloud that fills a 15-foot-radius Cube centered on yourself, and you move up to your Speed. The Cube is Heavily Obscured. It lasts for 1 minute or until a strong current or wind (such as one created by Gust of Wind) disperses it.