Soft sponge and anemone has formed this flexible staff, empowered by a sliver of tidal magic retained by the marine critters. The life guards at Seren Beach keep a couple around as flotation assistants.
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Tidepool Staff
Weapon (quarterstaff), rare (requires attunement)
You have a +1 bonus to attack and damage rolls made with this magic weapon. While attuned to it, you gain a swim speed equal to your walking speed and you can hold your breath for an additional 5 minutes before you begin to suffocate.
Buoy. While you hold this staff, you can use a bonus action to decrease this staff's density so it can float to the surface of any liquid. It can support creatures and objects that weigh up to 500 pounds on its way to the surface. This effect lasts until you use another bonus action to touch the staff and end it.
Ebb and Flow. Whenever you hit a Large or smaller creature with a melee attack using this weapon, you can attempt to move it with the tide. The target must make a DC 15 Strength saving throw. On a failed save, you either push it up to 10 feet away from you or move it up to 10 feet to another space within your reach.