Rage mage

A mage that channels their rage into their spell-casting ability, which allows them to destroy everything in their path.

Berserk spellcasting

Whenever you cast a spell you can deal an additional 1d6 damage of the spells damage type to all creatures within 5 feet of the spells range.

Flare shield

Whenever a creature comes within 5 feet of you while this trait lasts, you can cast a damaging touch spell on them as a reaction, but all damage done to the target creature is counted as a damage type that was chosen on the activation of the trait. Also as a bonus action, once per long or short rest you can activate this trait and choose a damage type.

Uncontrollable rage

You now gain the ability to rage twice per day which will increase every 3 levels after this one, and the damage from your Berserk spellcasting is now increased to a 1d8. Also as an additional effect when you rage you are able to cast spells and concentrate on the normally despite the effects of rage.

Dominant rage

While you are raging you can apply your intelligence modifier to your spell attack damage, Berserk spellcasting and Flare shield. Also while raging you can cast an additional damaging cantrip when you take the attack action, that cantrip AOE is now a sphere with a 10 foot diameter. If that cantrip already had a higher AOE than increase its current diameter by 10 feet.