you need to download it from xbox live marketplace as an add-on for about 2400 Microsoft points.
Shivering Isles is an expantion pack for Oblivion.
Shivering Isles is an expansion pack to Oblivion, and can't work without it.
You can't buy any in the isles
yep
they are just scenery
Steam has it, with Knights of the Nine also.
Achievements for the Shivering Isles in Oblivion may appear if you are playing on a platform that allows for mods or if you have access to a version of the game that includes achievements tied to the expansion, even if you haven't purchased the expansion itself. Some versions of the game may enable achievements based on content that is technically part of the game but not actively accessed. Additionally, certain promotional events or updates can sometimes unlock achievements related to expansions regardless of ownership.
Yes...game of the year edition contains both expansions (Shivering Isles/Nights of the Nine)
yes. anything you acquire in the shivering isles can be used/worn/spent in cyrodil providing you keep the shivering isles installed if u ever uninstall it you will lose everything from the shivering isle u may have got.
Perfect Amber is the best but it requires the shivering Isles
Nope, you have to use filled soul gems on it.
There two "best" armor types in Shivering Isles. Perfect Amber is the best light armor, Perfect Madness is the best set of heavy armor.