The GCS Gress'sril (also known as the Exeron) was a 23rd century Gorn starship, a MA12 class VI cruiser. In the 2260s, this vessel was under the command of S'slee, and was the instrument of the devastating Gorn attack on the Federation outpost at planet Cestus III, the Cestus III Massacre. It was also known for being pursued by the Federation starship USS Enterprise after the massacre. (TOS episode & Star Trek 2 novelization: Arena; FASA RPG modules: Demand of Honor, Star Trek IV Sourcebook Update)

The Gress'sril was illustrated very vaguely in the remastered episodic presentation of "Arena" and does not closely resemble the MA-12 model as seen in FASA Corporation RPG reference works and modules. The ship as seen might represent some sort of variant from the class seen in non-canon works.
MA12-class class VI cruiser starships
GCS Gress'srilGCS Hssig'sseeGCS Sl'sasigri Gorn Hegemony insignia - STC Academy
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