The large warships of the Vidiians, used to hunt other species for healthy organs, one of which boards a duplicate Voyager in Deadlock and is destroyed when that ship's Janeway sets the self-destruct.
Vidiian starships are the vessels of the Vidiian Sodality in the first two seasons of Star Trek: Voyager. The Vidiians suffer from the Phage, a disease that destroys their tissue, and their ships are equipped to seize people and harvest their organs.
In Phage Voyager chases a small Vidiian ship into an asteroid lined with reflective chambers. In Deadlock a much larger warship attacks one of two Voyagers created by a spatial rift, and its boarding parties begin killing the crew for their organs. That ship's Captain Janeway destroys her own vessel, taking the Vidiian ship with it, so that the other Voyager can go on.
In Resolutions Tuvok contacts a Vidiian convoy in the hope of a cure for Janeway and Chakotay, and is ambushed by several ships before the doctor Danara Pel passes him the medicine.