That's interesting, but I'm not having the discussion on psionic Norse warriors again with you

(Though I agree that classes with powers and abilities fueled by emotions or the control of them should be flavored as psionic: Bard, Barbarian and Monks, frex).
In this here case, I'm making a berserker subclass for the fighter in a D&D game; much like the Samurai and Cavalier dont have much resemblance with the either the real life ones, nor the ones often seen in myths. They are (overly?) simplified to fit the fighter's theme. The archetype could be called Battlerager or Wrathbearer, I dont really care for now.
If WotC kept the old Mystic UA, it would have been nice to have psionic barb archetype that gains a few Disciplines from a list of: Crown of Rage, Crown of Fury, Bestial Form, Brute Force, Celerity, Iron Durability and Giant Growth(?).