Rhian Cratak was a Romulan Republican Force officer active in the 25th century.
Dr. Cratak was with the Romulan Star Navy during the Hobus supernova of 2387. Her family died on Romulus. She considered retiring to one of the colonies to be a doctor.
By 2409 Cratak was the chief medical officer of the Romulan Republic flagship RRW Lleiset. (STO mission: "Republic Day")
Cratak was present at a mission briefing before the attack on the Solanae Dyson sphere facility near the Dyson sphere's star. (STO mission: "A Step Between Stars")
Cratak first appeared in a non-speaking role as a background NPC in Dyson Joint Command during the mission briefing of "A Step Between Stars".