Explosive

Varies

A fine grey powder with large grains and the faint smell of sulfur and charcoal that comes in small packets weighing 1/2 pound.
  When ignited by 1 or more fire or lightning damage, it releases a blast of thick black smoke that fills a 20-foot radius. Everything in this smoke is heavily obscured for 2d4 rounds. At the start of your next turn after the number of rounds rolled, the smoke begins to fade leaving everything within the radius lightly obscured, and it clears completely at the start of your next turn after that.
Additional uses of the smoke powder extend the duration of heavy obscurement for an extra 1d4 rounds.