Ronin are warriors without masters or loyalty to any organization, only their code and freedom. They are opportunistic fighters who punish their opponents in combat after they fail to land a strike.

Level 3: Defensive Stance

Starting at third level, when a creature misses you with an attack you, you can use your reaction and make an opportunity attack against said creature. If the creature misses your AC by 5 or more, the attack is made with advantage.

When you miss with a reaction based attack you do not expend your reaction.

Level 3: Dashing Strike

Also at third level, once per turn, when you make a melee attack roll you can extend your reach by 30 feet, on a hit you appear within 5 feet of the target creature as part of the attack. You do not provoke opportunity attacks during this movement.

Level 7: Great Drifter

At seventh level, you can not have your speed reduced by difficult terrain.

When you make a wisdom based check you can add 1d8 to the roll, you can use this ability a number times per long rest equal to your proficiency bonus.

Level 7: Flash of Steel

Also at seventh level, as an action, you can move up to your speed in a straight line, each creature that comes within 5 feet of you during said movement must make a Dexterity Saving Throw or take 3d8 force damage, half on a success. You do not provoke opportunity attacks during this movement. You can use this ability a number of times per long rest equal to your proficiency bonus. The DC equals 8 plus your Strength or Dexterity modifier (your choice) and Proficiency Bonus.

Level 10: Seven Fold Strike

At tenth level, choose up to a number of creatures equal to your Strength or Dexterity modifier within 50 feet of you and make a proficient Strength or Dexterity based melee attack roll against said creatures, dealing 4d10 force damage on a hit. You can use this ability once per short rest.

Level 10: Steel Forged Strikes

Also at tenth level, your Flash of Steel damage increase to d10s. When you hit with a Dashing Strike you deal 1d10 additional force damage.

Level 15: Tireless Warrior

At fifteenth level, when you expend a use of your second wind ability you can make a melee attack as part of the action.

Level 15: Reaction Savant

Also at fifteenth level, you gain two reactions per round, regaining both at the start of your turn.

Level 18: Unwavering Defense

At eighteenth level, when you start your turn without expending any reactions on the previous round you gain 2d10 temporary hit points, and gain +5 to your AC until the end of your next turn.