Path of the Disciplined

From time to time, there is born a child into which a seemingly unquellable temper takes residence. An existence occupied by strife and conflict lies before them, and if lacking a proper outlet for this anger, perhaps even a life of ruin.
It is the wise, or perhaps lucky individual born into such circumstances who takes a firm grasp upon their existential frustration and wrestles it into submission.
Contrasting greatly with the prototypical brutish ways of those who carry the moniker of Barbarian, an individual who chooses to follow the Path of the Disciplined is one who seeks to control and refine the ferocity that lies within. To take this journey is to learn to subdue one's impulse to lash out in rage, and instead hone that anger into a more perfect, calculated rage.
----------------------------------------------------------
Created by u/TheDungeonNovice originally and posted on /r/UnearthedArcana. The original idea belongs to them, with some edits made by myself.

Empowered Discipline

3rd-level Path of the Disciplined feature

You learn to restrain yourself in order to cultivate your rage into something far more powerful.
Each time one of the following occurs while you are not Raging, you gain 1 Discipline Charge, up to a maximum of 2:
  * Once per round, when you make an attack against a hostile creature.
  * Once per round, when you take damage inflicted by a hostile creature.

Your current Discipline Charge decrease by 1 at the end of each of your turns that you have not gained a Discipline Charge or been in a Rage.
You gain additional bonuses at the beginning of your Rage that lasts throughout its duration based on the number of Discipline Charges you have when entering a Rage.

Discipline Charges	Additional Rage Bonuses
1	1d6+2 Temporary Hit Points, +1 Rage Damage
2	2d6+4 Temporary Hit Points, +1 Rage Damage, +1 to Melee Attack Rolls
3	3d6+6 Temporary Hit Points, +2 Rage Damage, +1 to Melee Attack Rolls, +1 Unarmed Defense AC
4	4d6+8 Temporary Hit Points, +2 Rage Damage, +2 to Melee Attack Rolls, +1 Unarmed Defense AC, +1 Brutal Critical Die
5	5d6+10 Temporary Hit Points, +3 Rage Damage, +2 to Melee Attack Rolls, +2 Unarmed Defense AC, +1 Brutal Critical Die

*Unable to actually add these to the sheet, will have to be manually done or simply remembered.

These additional temporary Hit Points only apply once per Rage.
The maximum number of Discipline Charges you can acquire increases to 3 at level 6, to 4 at level 10, and to 5 at level 14.

Honed Restraint

3rd-level Path of the Disciplined feature

Immediately after ending your Rage prematurely as a Bonus Action, you can choose to expend 1 Discipline Charge in order to attempt to recover the spent use of your Rage.
Make a DC 8(+2 for each round that your current Rage has lasted) Wisdom saving throw. On a successful save, you regain the expended use of Rage as well as Hit Points equal to your current Rage Damage bonus. On a failed save, your Rage ends prematurely as normal.

Channeled Fervor

6th-level Path of the Disciplined feature

Beginning at 6th level, your tempered will grants you the ability to channel your emotions into a limited set of preternatural abilities.
You gain the ability to cast the Calm Emotions spell and the Blur spell at 2nd level. You can use this feature to cast twice from this list of spells, regaining all expended uses on a long rest. Wisdom is your spellcasting modifier for these spells.

Forces of Provocation

10th-level Path of the Disciplined feature

You are able to gain additional Discipline Charges provoked by the various hardships you encounter in conflict.
You gain 1 Discipline Charge each time one of the following occurs while you are not Raging:
  * Once per round, when yourself or an allied creature that you can see within 60 feet is damaged by a critical hit from a hostile creature.
  * Once per round, when an allied creature that you can see within 60 feet is reduced to 0 hit points by a hostile creature.
  * Once per round, when you fail a saving throw triggered by a hostile creature.

Spotless Mind

10th-level Path of the Disciplined feature

When you enter a Rage and have at least 3 Discipline Charges, you can attempt to maintain concentration on a spell you are casting.
You must make a Wisdom ability check, the DC of which is equal to 10 + the level of the spell on which you are currently concentrating.
On a successful check, you maintain concentration on the spell as you enter your Rage. On a failed check, you may either choose to expend a number of Discipline Charges equal to the spell's level in order to maintain concentration or instead lose concentration of the spell upon entering your Rage.
You do not gain Additional Rage Bonuses of any Discipline Charge expended by this effect as you enter a Rage.

Ever Resolute

14th-level Path of the Disciplined feature

You gain proficiency in Wisdom saving throws.
Additionally, if you fail a saving throw while raging, you can expend 3 Discipline Charges and end your Rage immediately in order to instantly succeed against that saving throw.