Transphasic torpedo

The transphasic torpedo is a weapon used by Starfleet and designed sometime in the 2380s in an alternate future timeline. It was developed to specifically handle the Borg threat. This technology was introduced to Starfleet in 2378 by Captain Kathryn Janeway and the crew of the USS Voyager after returning from the Delta Quadrant with the help of an alternate future timeline version of Captain Janeway.

Operation
The technology is based on producing a very destructive subspace compression pulse. The torpedo, upon detonation, delivers the pulse in an asymmetric superposition of multiple phase states. Borg shields can only block one subcomponent of the pulse. The other subcomponents go through the shields and deliver the most of the pulse to its intended target. Every torpedo has a different transphasic configuration, randomly generated by a dissonant feedback effect to prevent the Borg from accurately predicting what the configuration of the phase states is.