Marlin Lunger

This rapier allows you to sail through the water to pierce your foes. You gain a +1 bonus to attack and damage rolls made with this magic weapon, and you don't suffer the negative effects of underwater fighting when you make an attack with it. Once on each of your turns when you attack with this rapier while underwater, you can glide up to 15 feet through the water, as part of that action, immediately before or after the attack.

Finesse: When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.

Proficiency: martial, rapier Source: The Griffon's Saddlebag: Book Two p. 121 (Third Party)