In the late 2360s and early 2370s, it was assigned to the Romulan Neutral Zone and made regular covert supply drops to pro-Romulan rebels on Psellus III under the command of Commander Palar.
On stardate 48531.8 the warbird was found by the USS Lionheart adrift in Federation space, her crew having succumbed to an unknown bio-weapon, later identified as Vidorian-B Fever.
The Lionheart began towing her to Starbase 25 and exploring the vessel, unaware of it being decontaminated. The IRW D'vairin arrived and beamed boarding parties aboard to reclaim the vessel. After a tense standoff, both crews worked together to find a cure and the source of it, a canister hidden aboard by the Tal Shiar. ("Marie Celestial")
The crew of the D'vairin returned the warbird to Romulan space.
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