Vendoth battle cruiser

Vendoth Battlecruisers were large warships fielded by the Vendoth military. These ships were larger then the D'deridex class and were heavily armed.

Like all Vendoth ships they were equiped with shields that solidified when hit by weapons' fire. This outer shell then acts as a sort of 'bandage' over the damaged portion of the shield allowing it to be repaired.

They were also armed with a type of energy weapon that when fired appears like a plasma burst. Its effects are however very different, when it comes into contact with another ship's shields it solidifies that area of the shields. The firepower of these weapons are similiar to more conventional energy weapons used in the Alpha Quadrant.

Premature arrivals
The nature of how the Vendoth travelled from their galaxy to Earth had a temporal component and several of these ships also arrived at various places and times in Federation history.

Two such vessels along with a Vendoth Scout arrived in 2374 in the Badlands. They engaged the USS Swiftfire-A and nearly destroyed the Federation ship. One of the Battlecruisers was destroyed by Dominion forces lured into the area by the Swiftfire. The other was sabotaged by rebels to stop the ship from imposing the Vendoth's will on the rest of the quadrant. (Star Trek: Swiftfire: The True)

Attack on the Federation
Over two dozen ships of this type were part of the sixty-four ship strong fleet that attacked Earth in 2376. (Star Trek: Swiftfire: United We Stand)

External link
Star Trek Unity - The Adversary