The Thunderlizard class photon artillery was a type of mobile siege unit used by the military of the Romulan Star Empire. They were noted as being one of the most feared vehicles on the battlefield and were a showcase of sophisticated as was common with Romulan designs. A unique photon shelled delivery system allowed the artillery to fire its deadly payload from the centre of the craft rather then be mounted on a turret. This provided stability for the artillery and allows the firing of more powerful shells into enemy lines. (TOS game: New Worlds)