Like all Vendoth ships they were equipped 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 similar to more conventional energy weapons used in the Alpha Quadrant. (Star Trek: Unity (crossover))
Attack on EarthEdit
In 2376, a Vendoth scout ship attacked the USS Determination, sending it to the surface of New Bolarus. Sending scouting parties to the surface, the Vendoth confronted the USS Cantabrian-A, but didn't bargain on the USS Peacekeeper's ability to shrug off their energy weapons, causing significant damage to the Vendoth scout ship. Instead of surrendering or retreating, the Vendoth ship was set on self-destruct, but Cantabrian Captain Noah Wrightson beamed the crew to a chilled cargo bay, sending the Vendoth into a type of hibernation. The Vendoth scout ship exploded. (Star Trek: The Cantabrian Expeditions: "Howl")