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The Daedric Crescent Blade is in Elder Scrolls III: Morrowind. Bethesda included an artifact book from Morrowind in Oblivion, but many of the artifacts cannot be found in Oblivion.
You can't, you can only get it in "The Elder Scrolls III: Morrowind"
The Ice Blade of the Monarch is in TES 3 Morrowind, not Oblivion. You may be able to find a mod that will add it to the game but I'm not sure.
You can wander all around the map but it's not really a 'free roam' game in the sense of an RPG such as Morrowind. Mount and Blade is a tactical battle simulator with a lot of RPG elements.
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yes
no
No Morrowind is a one player game, but I've heard of a failed beta of an online Morrowind for the PC.
All of "arena" is not as graphic as morrowind by quite alot. So everywhere you look morrowind is going to look better, but they are both fun.
You cannot become a Frost Atronack on Morrowind, the best you can do is summon one.
No.
Yes, you can become a werewolf in "Morrowind: game of the year edition", as it comes with the "Bloodmoon" expansion.