Energy dampening weapon

The energy dampening weapon (or energy dissipator) was an advanced energy weapon used by Breen forces in the mid-2370s during the Dominion War.

The Breen energy dampening weapon was based on a forgotten Tholian type of technology. 

Samir al-Halak had heard rumors of the Breen's development of a new weapon designed to dissipate focused phased energy in 2336. 

The weapon was first encountered by Federation forces when the Breen entered the Dominion War as allies of the Dominion in 2375, at the Second Battle of Chin'toka. Since the Federation Alliance had never encountered the weapon before, it was especially effective against them. The weapon works by draining the energy of targeted ships, disabling their engines, weapons, and shields, thus making them easy targets for conventional weapons. Amongst the vessels lost to the weapon was the USS Defiant (NX-74205). 

The Klingon ship IKC was not affected as its tritium intermix chamber had been modified. Several weeks later, Kira Nerys and the Cardassian Liberation Front hijacked a Jem'Hadar attack ship for Starfleet to analyze its energy dissipators. 

The Alliance discovered a countermeasure just prior to the Battle of Cardassia,, the Federation Alliance succeeded in developing a countermeasure to the Breen weapon, forcing the Dominion to discontinue its use.