The Sovereign Battlecruiser is exclusive to Matt Horner in Co-op Missions. They are tougher than regular battlecruisers, and can be called down from the Dominion starport anywhere there's vision. With its ATX laser batteries equipped, the Sovereign battlecruiser can fire while moving. These ships can be upgraded to change its weapons to a burst weapon, dealing heavy damage to larger targets like hybrids. Sovereign battlecruisers can switch between the two modes to fight enemies as needed. Sovereign battlecruisers can also tactical jump from the start, unlike the other Horner ships which require research to do so.
The unit is available from level 1. While players at level 1 do not get the research benefits of the fusion core (such as the Mini-Yamato reactor research nor the ability to upgrade their Galleons), it is still worth building one to unlock this unit as other gas-heavy units are limited. The battlecruiser can be a useful gas dump that requires minimal repair micro, until Endurance Training is provided at level 11.