A giant fireball forms in your hand. You take it and smash it against your body and take 1d4 fire damage. Now you get to add 1d4 to every fire damage-based spell or cantrip you use for the next 15 minutes (1d8 at level 6, 1d10 at level 11, and 1d12 at level 16). You also gain fire resistance during those 15 minutes.