The Fire Berserker

Blessed with the power of The Nine Hells, you are able to infuse your weapon with a firey rage, allowing you to deal more damage. 3 times per short/long rest you can ignite your blade with the power of the nine hells as a bonus action. you minus your attack to hit roll by 2, but if you hit you can roll 1d4 at level 1, 2d4 at level 2, and so on until level 5 to add fire damage along with the normal damage.

At 5th level, your flame burns brighter. roll 4d6 for damage instead of 5d4. increase the roll by 1 dice every 2 levels. for example, 5d6 at level 7.

At 9th level, Your flame grows even brighter. Add your wisdom modifier +2 to your roll. at this level, you roll 7d6+2+WIS