You've awakened psionic powers, albeit fairly different to how most do. Your psychic abilities make you crackle with volatile purple energy which can be use to empower yourself & allies.

Violet Psy-Knights take to the battlefield through blade and brains to support their allies and crush their enemies.

Psionic power

3rd-level Violet Psy-Knight  feature

 

You harbor a wellspring of psionic energy within yourself. This energy is represented by your Psionic Energy dice, which are each a d6. You have a number of these dice equal to twice your proficiency bonus, and they fuel various psionic powers you have, which are detailed below.

 

Some of your powers expend the Psionic Energy die they use, as specified in a power’s description, and you can’t use a power if it requires you to use a die when your dice are all expended. You regain all your expended Psionic Energy dice when you finish a long rest. In addition, as a bonus action, you can regain one expended Psionic Energy die, but you can’t do so again until you finish a short or long rest.

 

When you reach certain levels in this class, the size of your Psionic Energy dice increases: at 5th level (d8), 11th level (d10), and 17th level (d12). The powers below use your Psionic Energy dice.

 

Protective Field. When you or another creature you can see within 30 feet of you takes damage, you can use your reaction to expend one Psionic Energy die, roll the die, and reduce the damage taken by the number rolled plus your Intelligence modifier (minimum reduction of 1), as you create a momentary shield of telekinetic force.

 

Psionic Strike. You can propel your weapons with psionic force. Once on each of your turns, immediately after you hit a target within 30 feet of you with an attack and deal damage to it with a weapon, you can expend one Psionic Energy die, rolling it and dealing force damage to the target equal to the number rolled plus your Intelligence modifier.

 

Telekinetic Movement. You can move an object or a creature with your mind. As an action, you target one loose object that is Large or smaller or one willing creature, other than yourself. If you can see the target and it is within 30 feet of you, you can move it up to 30 feet to an unoccupied space you can see. Alternatively, if it is a Tiny object, you can move it to or from your hand. Either way, you can move the target horizontally, vertically, or both. Once you take this action, you can’t do so again until you finish a short or long rest, unless you expend a Psionic Energy die to take it again.

Rallying Cry

When you choose this archetype at 3rd level, you learn how to inspire your allies to fight on past their injuries.

When you use your Second Wind feature, you can choose up to three creatures within 60 feet of you that are allied with you. Each one regains hit points equal to your fighter level, provided that the creature can see or hear you; as you use psionic crackling energy revitalize them

Improved critical

Thanks to your psionic abilities you've figured out how to use them to steady your attacks or momentarily hold targets still to better strike at vital points.

 

Rolling a 19-20 on a to hit counts as a critical

Inspiring Surge

Starting at 10th level, when you use your Action Surge feature, you can choose one creature within 60 feet of you that is allied with you. That creature can make one melee or ranged weapon attack with its reaction, provided that it can see or hear you; as you energize them with crackling purple psychic energy for a moment.

Starting at 18th level, you can choose two allies within 60 feet of you, rather than one.

Psionic Warp

At 10th level, you gain the ability to teleport up to 30 feet to an unoccupied space you can see when you use your Action Surge. You can teleport before or after the additional action.

Guarded mind

15th-level Violet Psy-Knight feature

 

The psionic energy flowing through you has bolstered your mind. You have resistance to psychic damage. Moreover, if you start your turn charmed or frightened, you can expend a Psionic Energy die and end every effect on yourself subjecting you to those conditions.

Bulwark of force

18th-level I Violet Psy-Knight feature

 

You can shield yourself and others with telekinetic force. As a bonus action, you can choose creatures, which can include you, that you can see within 30 feet of you, up to a number of creatures equal to your Intelligence modifier (minimum of one creature). Each of the chosen creatures is protected by half cover for 1 minute or until you’re incapacitated.

 

Once you take this bonus action, you can’t do so again until you finish a long rest, unless you expend a Psionic Energy die to take it again.