Susanoo's Tsunami

9th-level evocation

Casting Time: 1 action

Range: 300 feet

Components: V, S, M (a vial of seawater)

Duration: Instantaneous

You summon a massive wave of storming seawater, crashing through a 100-foot cone. Each creature in the area must make a Strength saving throw, taking 20d10 bludgeoning damage on a failed save and being knocked prone. On a successful save, they take half damage and are not knocked prone. The area is flooded for 1 minute.