A new type of torpedo developed during the Dominion War. An engineer on one of the <Science Class> vessels had a flash of inspiration on how to deal with the mass attacks of the Gem'hadar assault craft. The photon torpedoes are built with a warp sustainer motor and he bellieved if it could be detuned at the right time it could crash a ships warp field. Given the case that most warp fields extend beyond the shield radius, this could provide a means on evening up the "quantity of Hulls" problem that was the main source of UFP Admiralty angst.
The engineer figured he could cause the torpedo to detonate with a massive static form of warp field pulse which would detune the targeted warp field, possibly even causing reactor safteys to shut down the reactor due to the energy feedback through the warp coils. The blown EPS conduits, in any case, would take the ship out of the fight for a fair amount of time.
With experimentation, weapons officers were often able to break up the Gem'hadar assault triplets with this device, sometimes detuning all 3 drives before they could make their passes. Those triple attacks would drop the UFP deflectors for the third ship to hit bare hulls with a full salvo. With the first and second ships frequently being diabled these attacked became less effective.
Thes torpedos are little more than a regular photon torpedo with the targeting software modifed and linked into the motor to cause a near miss detonation with the EPS conduits going to the cassing coil beefed up to handle the motor power surge. The warp coils melted down like an old fashioned fuse, but lasted long enough to kick of a broad spectrum of intense, short spike, subspace static that destabilized warpfields.