Pirate of the water lands

You spent your youth under the sway of a dread pirate, a ruthless cutthroat who taught you how to survive in a world of sharks and savages. Now, you've become a feared pirate in your own right. You have indulged in larceny on the high seas and sent more than one deserving soul to a briny grave. Bloodshed and the pursuit of treasure are no strangers to you, and you've garnered a somewhat unsavory reputation in many a port town.

How is your footwork

When you choose this archetype at 3rd level, you learn how to land a strike and then slip away without reprisal. During your turn, if you make a melee attack against a creature, that creature can't make opportunity attacks against you for the rest of your turn.

You cheated

Chivalry and honour are for people who want to die politely, you would rather live to fight another day, you are not above using your skills in combat to get the upper hand

Before you make a melee attack in combat you may choose to make an attempt to trip, blind or somehow hinder your opponent giving you advantage on your next attack. To do so choose either STR or DEX and make an opposed roll against your opponent if you are sucessful you gain advantage on your next attack. 

You may apply this advantage immediately if your opponent has already been hit by a spell or attack this round and you are on the opposite side of the enemy to their attacker. this counts whether the attack was melee or ranged, and regardless of the source of the attack

Supreme Sneak

Starting at 9th level, you have advantage on a Dexterity (Stealth) check if you move no more than half your speed on the same turn.

Use Magic Device

Starting at 13th level, when you use your Uncanny Dodge to halve the damage of a melee attack against you, you can also move up to 15 feet away from the source of the damage as part of the same reaction. This movement does not provoke opportunity attacks.

There should be a Captain in there somewhere

Beginning at 17th level, your mastery of the blade lets you turn failure into success in combat. If you miss with an attack roll, you can roll it again with advantage. Once you do so, you can't use this feature again until you finish a short or long rest.