Swiftblade

"Extremely fast and dexterous, the Swiftblade is the epitome of speed." Based on the Prestige class from 3.5e, Swiftblades are all about moving around the battlefield as quickly as possible.

Blurring Blades

Starting at 3rd level, once on each of your turns when you make a melee attack against a creature, you can choose to distract the target. That creature can’t make opportunity attacks against you for the rest of the turn.

Additionally, you can cast the Longstrider spell on yourself. You can do this a number of times equal to your Charisma modifier (minimum of once), and you regain all expended uses when you finish a long rest.

Swift Instincts

Your arcane training allows you to act more quickly in battle. You can give yourself a bonus to your initiative rolls equal to your Charisma modifier (minimum of +1).

Arcane Swiftness

Starting at 7th level, when you use your Action Surge, you can also cast the Haste spell on yourself.

Unstoppable Speed

By 10th level, you have become unstoppable. While you are under the effects of the Haste spell from Arcane Swiftness, you are also considered to be under the effects of the Freedom of Movement spell, and you can take the Dash action as a bonus action.

Esoteric Alacrity

By 15th level, your repeated use of magic has strengthened your control over it. When you cast the Haste spell on yourself with Arcane Swiftness, it cannot be dispelled by anyone other than you, unless you fall unconscious. In addition, when it ends, you don’t suffer the spell’s negative side effects.

Practiced Reflexes

Also by 15th level, you have spent so much time going so quickly that you have imprinted faster reaction times into your instincts, even when moving slowly. You gain proficiency in Dexterity saving throws.

Time Warp

At 18th level, you gain the ability to briefly stop the flow of time for everyone but yourself when you use Arcane Swiftness. No time passes for other creatures, while you take one additional turn, during which you can use actions and move as normal. Once you’ve used this feature, you suffer one level of exhaustion, and you can’t use it again until you finish a long rest.