Shrine of Nocturnal

The "Shrine of Nocturnal" or the "Misery Vaults" are located just north of "Dagon Fel" situated below the ocean, you'll need to acquire the nearby key in order to enter the ruins, but for the adventurer brave enough to delve these decrepit and albeit dangerous ruins awaits many a prize, in fact the accumulation of treasures and wealth surpasses all other Daedric ruins in scope, and it's quite frankly a good bit larger in scope than most Daedric ruins. You can even acquire a couple of rare artifacts from the delve to use to your own discretion, a slightly weaker set of medium Daedric armor (dubbed "Evergloam armor"  and an amulet (The Eye of Nocturnal), all of which can be found inside the shrine, as well as a repurposed cut item, the Daedric longspear which I edited to match the armor set.

The "Nocturnal" statue asset was originally created by "The Wanderer" courtesy of their "Statues" mod and edited slightly by myself. The final prize comes with a hefty price to the adventurer brave enough to seize it, in fact this entire delve is best trialed with a high-level character. This mod was designed with HD textures and better bodies in mind and will look out of place devoid of either. And for more rewards, come prepared with a high security skill or some unlocking spells. This mod was essentially created to test my meddle as far as dungeon design is concerned, and boy did I, these decrepit vaults may stand the test of time!

"Why was the armor set changed to medium and made weaker?":

For strictly balancing reasons, I changed the existing "Evergloam armor" to be a medium set with slightly weaker stats when I finalized the rest of the armor set, I figured it would make sense giving there exists no medium armor close to or on par with daedric.