Path of the Rage Mage

A barbarian who follows this path wishes to cast magic and won't let not knowing how stop them. By exerting the force of one's will, anything is possible.

Because I said so

When you follow this path at 3rd level, you decide that you really want to cast magic. So you do. You may choose 2 warlock cantrips and three level 1 spells from the warlock spell list. You have 2 slots to cast these with. Throughout the scaling of this ability, all spells must be cast at the highest level available. 

Upon reaching level 6, you may select two level 2 spells and an additional cantrip. You also have an additional spell slot for a total of 3.

At level 10, you may select another cantrip, another level 1 spell, another level 2 spell, and two level 3 spells. You now have 4 spell slots.

At level 14, you may select a final cantrip and one level 4 spell. You now have 5 spell slots.

Level 10 options

Select one cantrip, one level 1 spell, one level 2 spell, and two level 3 spells.

Level 14 options

Select one cantrip and one level 4 spell.

Level 3 options

Select a two cantrips and three level 1 warlock spells.

Level 6 options

Select one cantrip, and two level 2 spells.

When I want

At level 10, you have further mastered your magic. When a creature provokes an opportunity attack from you, you may use your reaction to cast a spell with a cast time of at most 1 action.

Because I can

At level 3, your anger fuels you're magic. So long as you are raging, you may add your rage bonus to the damage of your spells. However, while raging, you are unable to concentrate on a spell. Thus any spell requiring concentration or more than 1 action to cast cannot be cast while you are raging.

I do what I want

At level 6, you have gained a form of mastery over your spells. When you take the attack action, you may cast a cantrip as one of the attacks instead of making a melee attack.

How I want

At level 14, your anger has infused itself with your magic. While raging, you have advantage on all spell attack rolls.

You have also learned to hold onto the magic from your spells. You are now able to concentrate on spells while raging.