Marine

Using a mainhand 'Light' weapon of choice or an empty mainhand, the offhand of this close quarters fighting class is used to wield a versatile small thrown weapon to block attacks and throw at enemies.

This subclass masters the use of this offhand weapon, to bring quick attack and ranged flurries as they progress in level.

Salty Dog

You get Swim Speed equal to walking speed

You are proficient with any vehicle on the sea

You can hold your breath for double your standard (Min. 10 Minutes)

Advantage on Acrobatics or Athletics checks when at sea.

+1 AC when wielding a simple melee weapon with the thrown property, or small improvised weapon in your offhand (Max 1d6)

Also when wielding this simple weapon you may make a grapple without the need of an empty hand.

When making a thrown weapon attack, being within 5 feet of a hostile creature doesn’t impose disadvantage on your ranged attack rolls.

Sea Legs

Starting at 7th level, whenever you are hit with a ranged attack you can use your reaction to force the attacker to roll again, taking the lower of the two rolls. You can do this an amount of times equal to your proficiency modifier, refreshing on a short rest

 

Main Gauche

Starting at 10th level, when wielding a simple melee weapon with the thrown property in your off hand. Whenever you succeed on a special Melee Attack (Shove or Grapple) you can make a free attack with your offhand weapon.

Hoorah

Starting at 15th level you learn to manipulate the morale of the battlefield

You are able to empower a war cry, all friendly creatures who hear the cry can use their reaction to take the Dash, Dodge, or Disengage actions. Or make a single weapon attack. This cry can be heard 30 feet away plus 10 feet times your constitution modifier.  You can do this once, refreshing on a short rest.

You also gain advantage on any persuasion or intimidation check to convince enemies to surrender or flee.

Armed to the teeth

Starting at level 18, whenever your offhand is empty you can equip any weapon into your offhand as a free action.

You can throw your offhand weapon as a bonus action.

When you hit a target with your thrown weapon you get a free thrown weapon attack. Each time you hit with this attack you can throw an additional weapon, up to a maximum of five additional attacks. (Not including the initial attack, limited by the amount of weapons equipped) This skill can occur as many times as your proficiency modifier plus one, refreshing on a short rest.