Opportunist

You have become adept at acting whenever you see the chance.

Sprint

Beginning when you choose this archetype at 3rd level, whenever you Dash you gain an additional 5 movement as well as the regular benefits.

Surprise Strike

Starting when you choose this archetype at 3rd level, as long as you don't have disadvantage on the attack, you can spend an action to add your Sneak Attack to all opportunity attacks you make until your next turn, even if you have already used it this turn. Additionally, if an effect would prevent you from being able to make an opportunity attack, you can instead make the attack with disadvantage.

Reactive

Starting at 13th level, you gain an additional number reactions equal to your dexterity modifier (min 1). You regain these reactions at the end of combat.

Ready Attacks

Starting at 9th level, you can use a reaction to make an opportunity attack against a creature, even if the creature has not done anything to provoke one.

Brace

Starting at 17th level, you can use any number of reactions to gain resistance to a number of damage types or conditions equal to the number of reactions spent until your next turn. If you are already resistant to a condition or damage type, you can use 2 extra reactions to become immune to it.