Firefly

Casting time: Action - Range: 60ft - Components: V,S - Duration: 3 rounds
A sparkling firefly flies from your hand to a maximum of 60 feet along a path you can choose leaving behind a trail of thick black smoke 5 feet wide, and 10 feet high. The sparks deal 1 fire damage on contact to everything it passes.The smoke is heavily obscured terrain and lasts for 2 rounds after which it will become lightly obscured and disappears one round later.