Oblivion - Secret door to boss-level treasure in forest (XBOX 360, PS3 and PC)

Very easy access to boss-level Ayleid cask from forest. I accidentally found this door earlier on PS3.
Save OUTSIDE so you can test loot as many times you want moving only one step and without waiting 3 days. If you don't save, you must go out and wait until chest respawns. This small 'room' is part of Ceyatatar Ayleid ruin.
You can find amulets, rings, armor, staffs, alchemy apparatuses, skill books and so on, but you cannot find weapons here.

Requested Alchemy tutorial:
http://www.youtube.com/watch?v=4wCrmT...

PS3 version of this video:
http://www.youtube.com/watch?v=F9ZwGB...

Ceyatatar info:
http://www.uesp.net/wiki/Oblivion:Cey...

Many asks about gauntlets and head 'thing'. They are from Ancient Towers mod, which requires patch (v1.2.0416) and Shivering Isles expansion:
http://www.tesnexus.com/downloads/fil...

Saint cuirass is from Black Luster weapons and armor mod:
http://www.tesnexus.com/downloads/fil...