Rose Quartz Koi
This Tiny crystalline sculpture of a fish weighs 2 pounds and looks miraculously lifelike. When you place or release the sculpture at a point underwater, it comes to life and swims around in a 5-foot-cube centered on that point. If placed in a container of salt water that's no larger than 5 feet on a side, the water inside becomes fresh after 10 minutes. You can use an action to recapture the swimming sculpture.
Two dozen men brought the queen a gift for her birthday: jewelry, armor, weapons, fantastical beasts, yet nothing pleased her. The old, soft-hearted jeweler was last, bringing a small crystal fish to her which drew laughter from the court, from all but the queen. The land was far from suitable for any average fish to live in her pond, the water hot enough to peel the skin off of most at a moment’s notice. Now? Her pond is filled with the tiny swimming gems, and her garden decorated with twenty-three heads.