One with the Shadows
Ultra rare0.2%StoryOptional
Returned the Thieves Guild to its former glory
Return the Thieves Guild to its former glory. Beyond the main Guild questline, complete the radiant 'city influence' jobs (Reputation quests) in all four major cities - Whiterun, Markarth, Solitude and Windhelm - to restore the Guild's reach. Doing those (plus finishing the main questline) triggers this. Talk to Delvin/Vex for the extra jobs.