Crushing Depths

4th-level evocation (sorcerer, warlock, wizard)

Casting Time: 1 action

Range: 120 feet

Components: V, S, M (a scale from a ziphius)

Duration: Concentration, up to 1 minute

You subject one creature you can within range to the pressure found deep underwater. The creature must make a Strength saving throw. On a failed save, it is restrained and takes 2d10 bludgeoning damage. On a successful save, the creature takes half damage and the spell ends.

A creature restrained by this spell can make another Strength saving throw at the end of each of its turns. On a failure, the creature is restrained and takes bludgeoning damage as above, and the damage increases by 1d10. On a success, the creature takes half damage and can move at half speed. The spell ends when the creature successfully saves against this spell twice. The successes don’t need to be consecutive.