Triton's tide

It is necessary to speak true triton tongue to cast this spell

You conjure up a wave of water, with electricity sparkling around, that crashes down on an area within range. The area can be up to 50 feet long, up to 25 feet wide, and up to 15 feet tall. Each creature in that area must make a Dexterity saving throw. On a failed save, a creature takes 6d8 bludgeoning damage, 4d6 lightning damage and is knocked prone. On a successful save, a creature takes half as much bludgeoning damage, no lightning damage and isn’t knocked prone. The water then spreads out across the ground in all directions, extinguishing unprotected flames in its area and within 60 feet of it, and then it vanishes.