Spore Romulan Warbird
The D'deridex-class Warbird (also known as the B-type Warbird or Warbird class) was the backbone of the Romulan fleet during the mid to late 24th century. The emergence of the massive D'deridex-class Warbird in 2364, during an encounter with the USS Enterprise-D on the edge of the Neutral Zone, signaled the end of a fifty-three year Romulan isolation. (TNG: "The Neutral Zone")
Over the next ten years, these Warbirds, under the command of both the Romulan military and Tal'Shiar, would participate in numerous encounters with Starfleet and the Dominion.
By 2374, they were prominently featured in the Dominion War, where they were instrumental in forcing the Dominion fleets back time and again.
The class saw action during the First and Second Battles of Chin'toka and the final showdown of the conflict, the Battle of Cardassia.
Despite their power, many ships of the class were destroyed by the Dominion, including the flagship. (DS9: "In the Pale Moonlight", "The Reckoning", etc.)