Savvy Shiphand

When you adopt this archetype at 3rd level, you adapt yourself to life at sea. You gain a swimming speed equal to your movment speed, and you gain proficiency with water vehicles, or another tool of your choice if you're already proficient.

Scoundrel's Strike

Additionally at 3rd level, you develop the mobility required for shipboard combat, and the skill to exploit an off-balance foe. Once per turn when you hit an enemy with an attack, you can use your Scoundrel's Strike if you have advantage on the attack roll, if an ally is within 5 feet, or if you've already hit the target with an attack this turn. When you do so, The attack deals an additional 1d8 damage of the weapon's type, and you can choose to apply one of the effects below.

• Opening Cut. You gain advantage on opportunity attacks against the target until the start of your next turn.
• Unbalancing Blow. The target can't make opportunity attacks until the end of your next turn.
• Infuriating Strike. The target gains disadvantage on its next attack unless that attack targets you.

Sea Legs

Also at 7th level, your balance and mobility reach their peak. Your jumping distance is doubled, and you gain advantage on all saving throws to avoid being knocked prone.