Shoot a beam of yellow light that explodes in 1 minute (Concentration) or when you end it early. Each creature in a 20-ft-radius Sphere makes a DEX save or takes 12d6 Fire damage (half on success). For each turn you maintain concentration, the damage increases by 1d6. Higher Slot: +1d6 per slot level above 7.

Material: a tiny ball of bat guano and sulfur