What are the benefits in refitting the Dawnstar Dark Brotherhood Sanctuary?

Solution 1:

From the wiki:

  • Master Bedroom. (Contains a mannequin, bookcase, and a tribute chest)
  • Torture Chamber. (Contains four prisoners who, if 'tortured' (ie: talked to), will reveal the locations of their treasure. Each location yields between 1,000 and 2,000 gold.
  • Secret Entrance. (Creates a secret entrance through the stain glass window in the main hall, the exit leads to the south end of Dawnstar near the Khajiit traders.)
  • Alchemy Laboratory with a poison garden. (Created an Alchemy lab and a small garden with poison oriented flora growing there.)