Explosive cascade

Explosive cascade was a spell used by sorcerers and wizards.

Effects
When cast, this spell created a brilliant sphere of flame. This sphere bounced around the immediate area. Any creature who came into contact with it was burned. It gave off the equivalent illumination of a torch.

Components
In addition to verbal and somatic components, the spell required a material component: a metal tube enclosed at one end stuffed with bat guano, sulfur, and copper.