Drop the Eyes of the Falmer off to Delvin in the Thieves Guild for a large cash reward. Whether the Key of Nocturnal happens to be returned to where no man should ever find it again immediately is up to you.
Killing him will cause the ruins to collapse, but you'll manage to escape with the Key of Nocturnal and the Eyes of the Falmer, and you'll be rewarded with being the new guild master. Easier said than done, as he has invisibility spells and is a fast little son of a gun, landing hit after hit if you're not prepared. You track Frey down to ancient dwarven ruins, which contain the legendary treasure 'The Eyes of the Falmer'.Īs you progress through the ruins and avoid his cleverly placed traps, you'll face off against Frey to make him pay. You find out he has also stolen the Key of Nocturnal - a lockpick that will never break and makes plans to leave Skyrim a rich man to whom no lock is impenetrable. You've discovered that Thieves Guild head honcho Mercer Frey has been filtering off the Guild's hard earned funds for years.