In one timeline the Zahl had destroyed the Krenim Empire and taken over their space. In this Zahl-dominant timeline USS Voyager encountered two of these vessels whilst passing through the area. Both ships vanished when an incursion by the Krenim Timeship altered the timeline to a more Krenim dominant one.

Very little is known about the ships. They can be assumed to have significant warp capability and weaponry, but no details are available.