Barbarian: Path of the Volatile Spellrager
Hello, this is my first time sharing a homebrew that I've created.
The idea behind this subclass is that your Barbarian was born with innate magic similar to a sorcerer, but this magic is chaotic and when you enter your Rage, it amplifies the magic within you. It crackles across your body and gives you a bit of resistance, though it's random each time you enter your Rage, and you can use your magic to imbue your weapons with an elemental strike.
Because the magic is innate, you also learn the Sorcerous Burst cantrip and can use it while your Rage is active, though it's the only spell you can cast while raging. You can channel your different elements into it, but if you cast the cantrip using the same element of which you have resistance, the spell gains a buff. Your magic is also growing more and more volatile until it reaches critical mass, allowing you to unleash a massive explosion of arcane energy.