Ring of the Aquan Guardian

Adventuring gear (wondrous item, ring), rare (attunement for additional effects)   While wearing this ring, you gain a swimming speed of 30 feet and can breathe underwater. You also gain the ability to command Lysidia, the Aquan Guardian within the Temple of Pure Water.  

Attunement

Once per day you can use your action to bind two targets - creature or object - together with a stream of ice cold water. If either target tries to move more than 20 feet away from its bound partner, it must expend 2 feet of movement for every 1 foot traveled and it both targets take 1d8 cold damage for every 5 feet it travels. This effect persists for 1 minute or until the targets move at least 50 feet apart.   You can open a telepathic channel between yourself and Lysidia for up to 10 minutes by fully submerging yourself in water and focusing on the ring allowing you to share thoughts with them. This can be done once per day.