Sharkskin Cloak

This cloak is made from the skin of an Acidic Giant Shark, its surface still slick with a faintly glowing green mucus. The cloak grants the wearer advantages in aquatic environments. While wearing the Sharkskin Cloak, you gain a swimming speed of 60 feet and can breathe underwater. Additionally, once per long rest, the wearer can release a toxic cloud of acidic mist in a 15-foot radius that lasts for 1 minute. Creatures that start their turn in the cloud or enter it for the first time on a turn must make a DC 15 Constitution saving throw, taking 3d6 acid damage on a failed save, or half as much damage on a successful one. The cloud is considered difficult terrain and disperses if blown away by strong winds or similar effects.