Shiarn is a Romulan mercenary.
Little is known of Shiarn, not even her real name. She has spent her life as a mercenary for hire, often pretending to be a Vulcan. How she and Gabriela Cariño became partners is only known to them. Shiarn has the emotionless manner of a Vulcan, and will kill just as easily without hesitation.
In 2393, Shiarn, working with a group of colonial extremists led by Cariño, hijacked the quantum slipstream starliner Charles Lindbergh, taking Trill Chief of Staff Anari Kthria and the other 3,300 people aboard hostage.