Cobalt bomb

A cobalt bomb was an explosive device with greater destructive power than that of a standard nuclear weapon.

A number of advanced races had access to cobalt bombs, or the technology to create them. These included:
 * Qataka (NA: Timewyrm: Genesys)
 * Greld (MA: The Empire of Glass)
 * Waro (PDA: The Devil Goblins from Neptune)
 * Cybermen (NA: Iceberg)
 * Klytode (DWAM: The Snag Finders)