The Rage of the Giants

-Player gains +10 to intimidation checks even while not raging.  (Only lose this if the player loses the ability to use Rage of the Giants.)

-While raging you gain:

-+3 to AC

-+3 to strength up to 25

-the character along with it's armor and weapons are considered one size larger

-since your weapon is now bigger it deals more damage.  You now roll 2x as many die as your original attack.  1d8 is now 2d8, 1d10 is now 2d10, 2d10 is now 4d10 and etc. 

-add 5 damage of the same type of damage as the weapon you are using to every melee attack

-take half damage from cold, fire, lightning, and thunder damage

-If the player lands 3 melee attacks in the same round then they can add 1d10 to the final attack

-If the player's rage ends early without the player ending rage on purpose, then the player takes 20hp of psychic damage.  They become stunned for 3 rounds unless they make a DC15 wisdom saving throw.  After regaining awareness, the player gains condition exhaustion lvl 1-3 at the dm's discretion.  The player can no longer use the feat Rage of the Giants until they complete a long rest.