"The Disruptor excels at controlling the battlefields of Eberron, then when the moment is right, blowing it all to Khyber. The blast disks they use to spread mayhem were developed at the start of the Last War in a collaboration between Brelish artificers and the gnomes of Zilargo, but the practice quickly spread to the other nations, and within a generation, all nations employed their own Disruptors as valued combat specialists. Now that the Last War is ended, Disruptors gravitate toward pursuits where they feel valued and useful, especially to adventuring and mercenary companies.
Scholars at Morgrave University also report finding evidence of ancient Dhakaani stone disks that suggest a similar tradition of arcane explosives. Explorers to the Tashana Tundra of Sarlona bear tales of dwarves there with similarly advanced explosive techniques."
(Authors' Summary)