Xiditte

Xiditte is a medium-sized, multilevel ruin located west of Pinnacle Rock and east of Vitharn, on the Shivering Isles. It's home to a large number of Zealots, as well as some Flesh Atronachs. Puzzles (some essential to escape) litter Xiditte, as well.

Levels
Xiditte - here you will find assorted Zealots and Flesh Atronachs, as well as an "office" of one of the Zealots, which contains several rare books.

The Catacombs can be accessed by pressing a button on the desk of a room on the northern side of the first chamber you encounter. You will then drop into a pit, and have to fight your way through a few Zealots. In the catacombs, there is a room containing several Grummite statues which must be properly rotated, and then shocked in order to enter a secret passage at the southern end of the chamber. This can be done by pressing the push buttons on the eastern enclave, as well as the button below the Hunger statue. Jump across a few support beams to a bridge, which takes you to a room containing a crystal chest, which has to have a Heart of Order to be activated.