The Nightsister Silri was a dark-side Force user from Dathomir who managed to escape the planet during the Galactic Civil War. Forming a tenuous alliance with the crime lord Tyber Zann, she worked with the underworld leader and helped him to unlock a powerful Sith artifact he had found. However, she had ambitions of her own and concealed the true power of the artifact. When Zann allowed the modified artifact to fall into Imperial hands, she was furious, but nevertheless accompanied him and his Talortai associate Urai Fen back to Coruscant in 4 ABY on a daring raid on Emperor Palpatine's private vaults. Fighting through Palpatine's elite guards, Zann was able to steal the pass key to the Emperor's files in order to amass incredible wealth. For her part, Silri struck out on her own and recov