What do you know about Molag Bal and Cold Harbor? "Castle Volkihar" is based on it.
Checkout "castle volkihar redux", it is based on the Molag Bal story line with armor from his realm "Cold Harbor" coming in the new online version, a blessing straight from Molag bal himself that trumps all those other wimpy daedric blessings put together. This mod is the size of a town. It's like 30 mods in one, more perks, spells and secrets than you can shake a stick at.