Kriosian battlecruiser

A Krios Battlecruiser docks with Enterprise

The Krios Battlecruiser was a type of warship used by the Kriosians during the mid-22nd century. Along with protecting Krios space, the Krios Battlecruiser was also assigned the duty of protecting the First Monarch and the Kriosian royal family, which was known across hundreds of worlds.

In September 2152, a Krios Battlecruiser rendezvoused with Enterprise NX-01 to receive and transport First Monarch Kaitaama. (ENT: "Precious Cargo")

In the final draft script for "Precious Cargo", this battle cruiser was consistently called an "Imperial Vessel" (apart from in a captain's log entry made in both the script and the actual episode). The script also described the craft as "slightly smaller" than the NX-class Enterprise.
The Krios Battlecruiser was evidently a re-use of the CGI for the Akritirian patrol ship, and even still had the emblem of the Akritirians.
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