Hellish Frenzy

You may use this feature as many times as equal to your intelligence modifier (minimum of 1). When you use a fire-based attack or spell you may add 1d4 (1d6 at 4th level, 1d8 at 8th, 1d10 at 12th, and 1d12 at 16th.) to the damage and/or the attack roll; whichever is applicable. All of the fire damage done by the attack or spell also ignores fire resistance, but not immunity.