Summon a 5-ft-diameter sphere of fire that lasts 1 minute (Concentration). As a Bonus Action each turn, move it up to 30 feet. Creatures the sphere moves through must make DEX saves or take 2d6 Fire damage (half on success). A creature ending its turn within 5 feet also makes the save. Higher Slot: +1d6 damage per slot level above 2.

Material: a bit of tallow, a pinch of brimstone, and a dusting of powdered iron