Path of the Mind

Most Barbarians rage out of anger and destruction, but these Barbarians rage due to being flooded with an insane amount of thoughts and by being overwhelmed with knowledge. This class is much more control of this rage however due to the higher amount of control the mind has over emotions. This subclass allows for a Barbarian to use their mass knowledge to use Psychic Abilities to overcome their foes, though it is very limited in the amount of uses they have.

Psionic Abilities

You learn the power of Psychic Energy through the power of your rampaging thoughts, you have a number of Psychic Points equal to your Proficiency Bonus, and can recover these on a Short or Long Rest. Below are the options you can choose from.

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Your brain is able to use telekinetic power to use certain abilities to send or take information. Spending a single Psychic Point, you can cast the Message Cantrip without the needed components. And by using 3 Psychic Points you can cast Detect Thoughts without the needed components. You use Intelligence as your casting ability for these.

Your mind is constantly filled with thoughts about your past that might be needed in the right situation. You can use this ability to recover anything that might be needed about a situation if you pass a DC 13 Intelligence (History) Check. You can use 2 Psychic Points to try and experience a memory of someone using a certain tool, if you succeed a DC 10 Intelligence (History) Check, this ability you gain proficiency with the tool used in the memory for the duration needed to fully use the tools. You have a number of these per Proficiency Bonus, and recover all expended uses after a Short Rest.

Your head fills with the desire to defeat your enemy to accomplish something, whether it be good or evil. Using those goals, allows you to channel your energy into a Psionic Blast. The blast emanates visible psychic waves from your head which shoot a psionic attack at your enemy, it has a range of 120 Feet, you use your Intelligence modifier to cast it, and it deals 1d10 psychic damage. The damage increases to 2d10 at Level 5, and 3d10 at level 11.

Study of the Arts and Mind

When you reach level 6 with this subclass, you have learned through advanced studying, a Skill and Language Proficiency. You also study the art of the Battle Master and learn a few things of your own. You gain the Martial Adept Feat, though you use your psychic powers instead of weapons (for instance if you took parry, you could use your mind to shove opponent's weapon out of the way instead of just using a weapon) any instance of a dice that requires a bonus other then Intelligence, now requires Intelligence. You can also use a Psychic Point to gain more superiority die

Psionic Overdrive

At 10th level, you use intense Psychic Energy to use one of three different psychic options to have the edge up on almost any situation there is, it takes up a whole Action, and you get this ability back once every Long Rest.

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You use the power of your intense thinking to try and see into the future and it's outcome. You can take 3 turns worth of actions and see it's outcome, every action you see fit is done where it is a success, but is unable to use the rolls done by this act, however acting out this plan gives advantage if done exactly as the vision was done.

You use the power of your conscious to make 2 identical clones of your character, shrouded in a colored aura of your choice. You can control these clones to do an action of your choice for 30 seconds after which the clones disappear, and if you choose, you can dismiss then as a bonus action starting on your next turn. These clones share your HP and if they take damage they share to you as well.

You use the power of extreme knowledge to know 2 things about a target of your choice, including stats, weaknesses, attacks, saving throws, etc. The target must make a DC 10 Saving Throw and has Disadvantage if you use 5 Psychic Points.

Master of the Mind

When you reach level 14 in this class, you gain three effects that enhance all your previous levels

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You now have Psychic Points equal to 3 times your proficiency modifier, Message and Psionic Blast now don't need a Psychic Point, Detect Thoughts now only needs 1 Psychic Point, and you can now use Telekinesis for 3 Psychic Points 

You gain an extra Skill and Language Proficiency and now have d8s for Battle Master

You have two uses of Greater Psionic Abilities per Long Rest