Pirate

When you chose this subclass when you reach level 3 you accept the fact that you were born to be a pirate and learn to do this to your full potential.

Dirty player

You know no rules in fighting. As long as you win any way is okay for you.

You gain some speacial battle maneuver only a true pirate would be willing to use:

Parley Strike: You sceam out "Parley", if the enemy shares any language with you, he has to make a wisdom saving throw. On a failed save the target is so confused and suprised by your parley call, that your attack has advantage and deals an additional 1d4 of the weapons damage.

Poke ya eye: You attempt to poke your enemy in one of his eyes (if possible). The target has to roll a dexterity saving throw. On a fail the target is blinded till the start of your next turn.

Hidden knife: You stab your enemy with you hidden knife from your boot, sleeve or hat.This attack deals an additonal 1d4 piercing damage This one of course is coated with poison. If your attack hits your enemy must make a Constitition saving throw. If the save fails this attack deals an additional 1d4 poison damage.

You can only use one of these effects per attack action.

You can use this maneuvers a number of times equaly to your Charisma+ your fighter level/5 (rounded down).These refresh with a long rest.

Your saving throw is: Charisma+8+Proficiency.

Pirate Proficiencies

Begining when you choose this archetype at 3rd level, you gain proficiency with either the hook or the pistol weapon.

In addition you get proficiency with water vehicles.

Ride the wave!

Once you reach level 6 in this class you learn how to use your experience living in the wild seas even when you are on solig ground. Your movement becomes so smooth, that you are very hard to hit once you started walking. Oppurtunity attacks made against you are made with disadvantage. In addition to this effect your training in not falling down from a wave helps you to stay on your feet if someone wants to knock you prone.

Ship proficiencies

You gain proficiency with ship cannons and in the Sleight of hand skill.

In addition you get proficiency for either the navigator's tools or cartocrapher's tools.

I got even more dirty!

Starting at 15th level, your dirty fighting becomes more effective.

Your dirty fighting maneuvers become stronger:

Parley Strike: Your additional damage increases to 3d4 of the weapons damage type.

Poke ya eye: Your eye poke now blinds the target for 2d4 rounds instead of only one.

Hidden knife: Your poison got way more potent. The poison damage increases to 2d6. 

Yohoho

The harsh life as a pirate and warrior of the sea has made you more resilient and charismatic than most other people.

Both you Constitution and Charisma increase by 2 to a maximum of 22.