Reality bomb

The Reality bomb was a super-weapon created by Davros for the use of the Daleks.

Overview
The weapon made use of the Stolen Planets transported to the Medusa Cascade, captured by the New Dalek Empire, along with the unique Z-Neutrino-based energy source of the Crucible. This bomb worked by canceling out the electrical field holding atoms together, and is capable of wiping the entire universe and all of creation; all except for those within or near the Crucible. Once the weapon penetrated the time rift at the heart of the Medusa Cascade, it would spread into every parallel universe and alternative dimension as well. The reality bomb was planned to destroy all other forms of life in every universe - except for that of the Daleks, to make them become the only race in all of existence.

The reality bomb was actually a electromagnetic cancelling wave, the emitter of which were several large, luminous green hemispheres set into the exterior hull of the Crucible. Each hemisphere was contained within a ring of panels which resembled the slats on a Dalek casing. There was a smaller scale version located inside the Crucible which was used for a successful test firing on a group of Humans.

The Doctor, and his companions, were successful in preventing the use of the full-size weapon. (DW: Journey's End)