"Sienov Mnhei'sahein" (Rihan: "Sword of the Ruling Passion") is a Star Trek Online fanfic by StarSword, part of the Bait and Switch 'verse. It was written for Unofficial Literary Challenge #28: "Death and Taxes" on the Arc Forums. When a local nobleman attempts to derail negotiations between the Romulan Republic and the Watraii Hegemony, Morgaiah t'Thavrau must defend the honor of her ship, her crew, and herself with cold steel.