Base Class: Fighter
Speed is your greatest weapon. Fighters who follow this path master momentum itself, turning motion into devastating force, blinding defense, and impossible bursts of acceleration that leave only afterimages behind.
Level 3: Momentum
3rd-level Accelerant feature
When you choose this archetype at 3rd level, your motion is guided by martial precision, allowing you to build and release kinetic force through movement.
Momentum Dice. You have a pool of Momentum Dice, which are d8s. You have a number of these dice equal to your proficiency bonus. A Momentum Die is expended when you use it, and you regain all expended Momentum Dice when you finish a short or long rest. These dice are used for your subclass features.
Burst of Speed. When you move on your turn, you can expend one Momentum Die to increase your speed by a number of feet equal to 5 times the number rolled until the end of the turn.
Driving Strike. Once per turn when you hit a creature with a weapon attack, you can channel your movement into the strike. You deal 1 extra force damage for every 10 feet you moved immediately before the hit.
Overdrive. As a bonus action, you can expend one or more Momentum Dice to push your body beyond its limits, multiplying your speed for 10 minutes. When you use this feature, choose how many dice to expend and determine the effect based on the total number of dice spent.
If you expend one die, your speed is doubled for the duration. When the duration ends, you gain one level of exhaustion.
If you expend two dice, your speed is tripled for the duration. When the duration ends, you gain three levels of exhaustion.
If you expend three dice, your speed becomes five times your normal speed for the duration. When the duration ends, you gain six levels of exhaustion.
You can expend additional Momentum Dice as a bonus action while this effect is active. When you do so, the duration resets to 10 minutes, and your speed multiplier increases to match the new total number of dice expended. The exhaustion from this feature is applied only when the final duration ends.
Level 3: Reactive Acceleration
3rd-level Accelerant feature
Speed distorts your place in the turn order.
Whenever your speed increases on a turn that isn’t yours, you gain one additional Reaction that must be used before the start of your next turn.
You can gain extra Reactions this way a number of times equal to your proficiency bonus per Long Rest.
You may take one of those extra Reactions immediately after the speed increase occurs.
If an effect doubles your speed on a turn that isn’t yours, the maximum number of extra Reactions you can gain from this feature is doubled for that duration.
Level 7: Slipstream
7th-level Accelerant feature
Slipstream Offense
Driving Strike now works with thrown weapons and ranged weapon attacks in addition to melee attacks.
When you hit a target using a thrown weapon or ranged attack, you deal force damage equal to your proficiency bonus per 30 feet you moved immediately before the attack.
Slipstream Defense
While you have moved at least 80 feet this round the sheer speed of your motion grants you a bonus to AC equal to your Dexterity modifier, separate from any other armor or AC bonuses.
When a creature misses you with an attack, you may use your Reaction to move up to half your speed without provoking opportunity attacks.
Level 10: Momentum Mastery
10th-level Accelerant feature
Your speed becomes a persistent battlefield force.
Your speed increases by 15 feet.
You ignore difficult terrain.
You can move through enemy spaces (no longer difficult terrain), though you cannot end there.
When you roll a Momentum Die for Burst of Speed, you may treat the roll as the maximum value once per turn.
Level 15: Perfect Velocity
15th-level Accelerant feature
While your speed is 150 feet or higher, your movement:
Does not provoke opportunity attacks.
Cannot trigger Reactions based on you entering or leaving a creature’s reach.
Ignores non-instantaneous effects during your movement.
You may move 5 feet through solid matter for every 150 feet of movement on your turn.
This feature does not function while under the effects of Time Stop or similar magic that slows or suspends time
Level 18: Accel
18th-level Accelerant feature
Discontinuous Step
While your speed is 300 feet or higher, your movement behaves as instantaneous relocation whenever you stop or change direction, allowing you to traverse the battlefield in a blur.
You can pass through creatures and objects, but must end your movement in an unoccupied space you can see.
If you end your turn inside an object, you are immediately shunted to the nearest unoccupied space and take force damage equal to twice your Fighter level.
Lightning Reflex
Your acceleration makes you nearly untouchable.
You cannot be Surprised.
You have advantage on Initiative rolls.
You are immune to lightning damage.
Whenever you are hit by lightning damage, your base movement increases by 20 feet for 3 rounds
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