Harrier

You excel in adroitness and agility above all else, even compared to other rogues  – using your honed bodily control, you can throw your momentum behind your efforts. Rogues that subscribe to this archetype can be lithe athletes, circus acts, runners for underground organizations, or specialized soldiers. The Harrier leverages their speed to accomplish feats that, at first glance, defy plausibility.

Runner's Soul

You gain proficiency with cobbler's tools, or if you're already proficient, you instead gain proficiency with your choice of leatherworker's tools or weaver's tools.

Instant Larceny

You have an uncanny ability to pickpocket and swipe objects when on the move. When you take the Dash action and you move within 5 feet of a creature or object, you can make a Dexterity (Sleight of Hand) check to attempt an act of legerdemain against the target as part of the same action, such as to pick a pocket or steal an item. Creatures have disadvantage on ability checks to notice such an act if you move more than 5 feet away from the target immediately after you make the check.

Lethal Flash

When you take the Dash action, you gain the benefits of the Dodge action while you're moving until the end of that turn, and you gain an additional way to use your Sneak Attack on melee attacks that turn: you don't need advantage on the attack roll to use your Sneak Attack against a creature if you moved at least 10 straight towards it before the attack. All the other rules for Sneak Attack still apply to you.

Mutefoot

It's second nature for you to step in ways others find unthinkable. You can move stealthily at a normal pace, and your movement on foot doesn't cause you to trigger traps unless you wish to. Additionally, while you're moving,  tremorsense can't pinpoint your location, and other creatures have disadvantage on ability checks to hear you.

Shadowless Flight

Your bursts of speed from a standstill can confound the eye, causing you to seemingly vanish into thin air. When you take the Dash action, you gain the following benefits until the start of your next turn:

• Your movement is unaffected by difficult terrain.

• You can calculate the distance you can jump using Dexterity, rather than strength.

• You can choose to be invisible while you're moving.

Inertia Hammer

You move so swiftly that your momentum hits like a meteor. When you use your Lethal Flash feature to deal Sneak Attack damage, the damage increases by 1d6 for every 10 feet you moved directly towards the target immediately before the attack (to a maximum of 10d6 additional damage).