This explosive alchemical substance is a tightly held secret of only a handful of alchemists in Zeif, Ekbir and Tusmit. They guard their secret well. Black Powder is dangerous, to say the least. If hit with a spark it causes an explosion based on the quantity used. Each dose (1lb.) does 1d8 damage. A small keg (15 lbs. of powder) explodes for 15d8 damage to everyone within 10' (reflex save DC15 for half damage).
Unfortunately, this powder is highly volatile and thus does not carry well. Those alchemists who know its secret continue their work in secret, trying to improve upon the formula to make a substance with real potential.