Rage Mage's Knowledge

Ability Score Increase. Your Int, wis, or Cha score increases by 1  

Rage Mage. You have learned to cross boundaries no other barbarian has before. When you take this feat you gain the ability to cast & concentrate on spells while you rage. Additionally, when you cast a cantrip you can add your rage damage bonus to the damage of the cantrip. Casting a spell for you counts as attacking a hostile creature during your rage.

Bonus Cantrip. You gain 1 cantrip from the wizard spell list of your choice from the Evocation or Transmutation schools. Your spellcasting ability for this feat’s cantrip is Intelligence, Wisdom, or Charisma (choose when you select this feat).