The Repulsor Weapon is a technological military device fitted to the Nomad Moon, created by the Taiidan Republic forces in an effort to stop the Beast. It worked by simply emitting a field that pushed and/or destroyed any ships in it's range.
Unfortunately, the Nomad Moon was infected by the Beast. After a tough battle, Kiith Somtaaw reverse-engineered the techonology used by the Nomad Moon and applied it to their Dreadnought.
The technology was not applied by the Hiigarans during the Vaygr War and is presumed to be outdated.