Brv'cllnz
From Tardis Wiki, the free Doctor Who reference
The Brv'cllnz were creatures of energy. They were highly advanced. They were generally a secretive species, and had no imaging technology.
One Brv'cllnz, Mrrct'llz, was an ambassador to the planet Delcanto, where he was executed by one of the planet's factions. (PROSE: The Light that Never Dies)