Chain reaction pulsar reflecting from a Borg cube.
The chain reaction pulsar weapon (also known as the chain pulsar or pulsar torpedo) is a type of highly-enhanced weapon that was introduced as an optional ship-mounted armament for Akira-class starship in the year 2376. Fired as a torpedo, when launched continuously drawing energy from its target becoming more and more powerful, until it impacts the target with the energy it absorbed. When used against multiple targets, it moves from target to target absorbing energy, until it unleashes its combined accumulated force on the final target.
The USS Jupiter was the first Starfleet vessel to employ this system. (ST video games: Armada, Armada II)