Shadow Hybrid Cruiser
This vessel was witnessed by techno Mages destroying an Earth Omega Class Destroyer. It has since been theorized to be an armed Shadow Transport (dismissed by some on the basis allies transpoted most of their equipment on example being use is the telepath processing units recovered by B5), a Shadow Allie Transport, and finally Earth Black Ops more then enough evidence present of their experimentations with Shadow Technology recovered from vessels. This can be proven by the existanc eof the Omega X Destroyer (hit the next button to see) and the fact that the Icarus did follow one such discovered cruiser when Shadows came and retrieved it after uncovering on Mars.
The only survivor of this vessels KNOWN ttacks is Captain Gideon of the IAS Excaliber