Dunbarrow Cove is a cave located behind and under Castle Anvil. The first section of the cove is called Smuggler's Cave and contains some crates, chests and barrels and can be accessed in the vanilla game.
However, the lower passage leads to Dunbarrow Cove itself, which is only available with The Thieves Den plug-in, while the upper passage, which can only be opened with the Smuggler's Key, leads to a secret section of Castle Anvil and ends up in the Umbranox private bedchambers.
The Smuggler's Key can be found in the chest at the foot of the bed inside the Captain's Quarters after having been upgraded.
|Upgrade||Cost||What one get|
|Fletcher||1000||Melliwin; sells Restoration-related spells that fortify agility, speed, Sneak and Marksman. Standard merchant with 100 selling a few bows and enchanted arrows. Expert Marksman trainer.|
|Fence||1000||Khafiz; standard Merchant/Fence with 1500 . Expert Mercantile trainer. His boar friend Bacon also roams the cove.|
|Security Expert||1000||Tahm Blackwell — Sells Restoration spells that fortify Sneak and Security. Merchant with 100 selling Security-related potions and scrolls. Expert Security trainer. There is also a Hard chest that you can practice lockpicking as many times as you want.|
|Spymaster||1000||Kovan Kren — Sells Restoration spells that fortify Sneak and Blade, as well as chameleon spells. Merchant with 100 selling light armor and a few enchanted pieces. Expert Sneak trainer.|
|Supplier||1000||Jak Silver; merchant with 100 selling lockpicks and stealth-related potions. Expert Speechcraft trainer.|
|Upgrade Quarters||500||An organized Captain's Quarters with a nice bed, set of drawers and a cabinet.|
|Total cost 5500|
- The Thieves Den - for list of the spells and other items included in the DLC.