Source: Arcana Unleashed
Weapon (Greatsword, Longsword, Rapier, Scimitar, or Shortsword), Rarity Varies (Requires Attunement)
This weapon is covered in oceanic motifs, from wavelike etchings on its blade to stylized sea monsters embroidered onto its leather hilt.
Barnacled (Uncommon). Barnacles dot this blade’s guard and the flat sides of its etched blade.
You have a +1 bonus to attack rolls and damage rolls made with this magic weapon. While holding this weapon, you can take a Magic action to touch up to a gallon of liquid and infuse it with brine, turning fresh water into saltwater, for instance.
Aquatic (Rare). The wavelike etchings on this weapon’s blade glow with light, shedding Bright Light in a 5-foot radius and Dim Light for an additional 5 feet.
Your bonus to attack rolls and damage rolls made with this magic weapon increases to +2. While you hold the weapon, you can breathe underwater, and you have a Swim Speed of 30 feet.
Ascendant (Very Rare). The sea monsters embroidered on this weapon’s hilt are studded with chips of colorful gemstones.
Your bonus to attack rolls and damage rolls made with this magic weapon increases to +3. While you hold this weapon, you have a Fly Speed of 30 feet; when you use this Fly Speed, a salty sea breeze carries you through the air.