Oceanic weapon

An oceanic weapon is a magic throwing weapon adorned with engravings depicting leaping dolphins and drifting jellyfish.

Description
The attuned owner of an oceanic weapon gains a +1 bonus to attack and damage rolls made with this magic weapon, as well as ignoring the normal penalties on ranged weapon attacks while using this weapon underwater. While the owner of an oceanic weapon holds it with both hands in front of them, they have a swimming speed of 30 feet. Additionally, while they hold this weapon, they can use an action to cast the Water Breathing spell. Once this property is used, it can't be used again until the next dawn.