Freerunner (VSoS)

Freerunners are accomplished through a skilled combination of dashing, leaping, and nimbly climbing that guides them down clever paths through their environments. Moreover, an adept freerunner can convert the momentum from their gymnastics into deadly force, crushing their enemies with exceptional impact from unexpected directions. 

A freerunner is most at home in a city or in the treetops of a great forest, for their unique movement requires a place that is steeped with complex geometry which reaches high into the sky. Of course, even on flat terrain, a freerunner's agility is not to be underestimated, for they can dive through a giant's legs or scurry up its back with ease.

Freerunning

Starting when you choose this archetype at 3rd level, you have trained extensively to move freely over and through any terrain using only the abilities of the body. You have advantage on Dexterity (Acrobatics) checks made to navigate obstacles while running and can use Dexterity in place of Strength when making a Strength 9Athletics) check to climb, jump, or swing on a rope.

Additionally, you have mastered a number of techniques. You can use your freerunning techniques a number of times equal to your Dexterity modifier, and regain all expended uses when you finish a short rest or long rest. While in your favored terrain, using a technique doesn't count against your total number of uses.

Momentum

At 3rd level, if you move through a hostile creature's space, leave a creature's reach, or move at least 15 feet, you deal an extra 1d6 damage on the next weapon attack you make on your turn.

Evasive Fighter

Beginning at 7th level, when you use a freerunning technique, you gain a +2 bonus to your AC until the start of your next turn.

Hit Hard, Hit Fast

Starting at 11th level, the extra damage from your Momentum feature increases to 2d6.

Nimble Dodge

At 15th level, when a spell or other effect would have you make a saving throw due to being in an area of effect, you can use your reaction to move up to half your speed, potentially moving you outside the effect's area.