This longsword, crafted from a smooth, polished sea rock that shimmers with a deep violet-blue hue, smells of saltwater and brine. When wielded, the sword's swings produce a distinct sound of waves crashing against rocks.
You have a +1 bonus to attack and damage rolls made with this magic longsword.
Sweeping Wave. Once per day you can swing the tidal blade in a wide arc, creating a powerful wave. Each creature within a 15-foot cone must make a DC 15 Strength saving throw. On a failed save, a creature takes 2d6 bludgeoning damage and is knocked prone and pushed 10 feet away. On a successful save, a creature takes half as much damage and is not knocked prone. The wave puts out all non-magical flames in the area.
Ocean's Might. If you use the blade in this way near a large body of water, the blade power is amplified, and you have a +2 bonus to attack and damage rolls. The sweeping wave ability area effect changes to a 30 ft. cone, and its damage increases to 4d6.
If you are a Patron you can get additional versions of this item: poker cards sized images, and for Foundry Tabletop in a separate post.