Submerged Reins

Wondrous item, rare

This necklace is made from knotted and woven seaweed. A small water lily blooms at its center. While wearing the necklace, you gain a swimming speed of 30 feet and can breathe normally underwater. Furthermore, you can speak its command word using an action to magically summon a warhorse with the following changes:

• The horse's mane is made of seaweed, and the necklace extends to become its reins. You're considered to be wearing the necklace while holding the reins, and you can't be knocked off the horse.

• The horse has a swimming speed of 60 feet and can breathe underwater.

• The horse can walk normally across water as if it were solid ground.

• When you move at least 20 feet toward a creature and then immediately hit it with a melee attack while mounted on the horse, that creature must succeed on a DC 14 Strength saving throw or be knocked prone. A creature knocked prone in this way also inhales a lungful of seawater; unless the creature doesn't need to breathe or can breathe underwater, it can't speak or breathe until it uses an action to cough and retch out the water.

The horse is friendly to you and your companions. When you summon it, it appears either beneath you (allowing you to mount it as part of the action) or in an unoccupied space within 10 feet of you. The horse remains for 1 hour or until it's reduced to 0 hit points, at which point it turns to seawater and leaves behind the necklace. Once summoned, this property of the necklace can't be used again until the next dawn.

He stood at the edge of the cliffs and looked out to the horizon. Like a wrinkle, a dark dot marred its perfect edge—a promise in the shape of a ship. His hand, absently, touched the seaweed necklace around his neck. It sat heavy there, but not half as so as the crown they would force him to wear, were he to stay.

No, he would leave his newfound haven before the priests could call his name. He would turn away vows and kingdom, happily, to chase the pirate queen who taught him freedom of choice.

With a whispered word, familiar, the Wayward Prince turned from the cliffs, now astride his sea-worthy steed. His hoof falls turned to distant splashes, then nothing.