Blade of the Sea

You gain a +1 bonus to attack and damage rolls made with this magic scimitar.
When you attack a creature and roll a natural 20 on the attack roll you project a tidal wave past the target creature. This wave is forms a line 20ft long, 10 foot tall and 5 foot wide. Each creature in that area must make a Dexterity saving throw (DC 14). On a failed save, a creature takes 2d8 bludgeoning damage (not affected by any critical hit doubling) and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone.

Requires attunement