Unknown Invaders Ships
Shortly after the formation of the Interstellar Alliance and group of Invaders came to B5 on their invasion routes core-ward from the the rim. it is unknown where they were coming from or what they were capable of B5 being lucky to have a small advanced warning. Their capital ships are around 1 km long and fully capable of cracking into enemy computer systems.
Their fighters are unusually large at about 50 meters in length (about half the length of their cruiser) but prove themselves highly versatile and manueverable for their size.
Their only other known vessel is their breaching pod which can clamp onto the hull of a ship or space station burn through the hull and unload 30 soldiers into the corridors of the target vessel. After their confrontations with Babylon 5 at Epsilon 3 they decided that invading this portion of the galaxy would consume too many resources and moved on.