Subspace warhead
A subspace warhead was a type of explosive device used in the subspace weaponry that was tested by an alien race at Subspace Munitions Range 434. 

Detonation of a warhead released an energy discharge that radiated high levels of subspace radiation in a level nine shock wave. In addition to doing heavy damage to any vessel close to the detonation, the radiation destabilized warp drives of vessels. The effective range of a shock wave was between five and twenty-six million kilometers. The residual area of radiation made it nearly impossible for starships to generate a stable warp field. 

The warheads were fired through subspace at targets that could be dozens of light years away from the launcher. As they emerged through the subspace barrier, a minor gravimetric distortion could be detected. The warhead locked onto any nearby ship that emanated a warp signature. ()

de:Langstrecken-Subraumsprengkopf
warhead
Explosive weapons