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The ChR Nel Trenco was a Romulan bird-of-prey.
In 2156, the Nel Trenco was under the command of Admiral Dagarth when it responded to the Haakonan attack on Trilakis. After the attack, the Nel Trenco wasn't heard from and was presumed destroyed. (ENT - The Romulan War novel: Beneath the Raptor's Wing)
By 2157, the Nel Trenco had been discovered and was back on active duty. Dagarth used the ship to deploy a mutagenic virus against Haakona Prime. (ENT - The Romulan War novel: To Brave the Storm)