Warning: You might want to make a copy of your save file before trying this.
Step 1:Purchase and download The Wizzards Tower on Xbox Live Marketplace.
Step 2:Now load up Oblivion, go to your map and fast travel to the Frostcrag Spire. Go inside of the building and once you are in the main room
go in the portal that takes you to the living quarters. Then save your game.
Step 3:Now go to your Dashboard and go to System. Then go to memory, click on your hard drive and then go to games.
Then find Oblivion and find the Wizzards Tower download and delete it(Don't worry you can re-download it for free)
Step 4:Go on Oblivion.Then load the game that you saved in the living quarters of Frostcrag Spire. It will appear that you are in a pitch black area with only one little light that you can see. Walk straight into the light(may take up to 3 or 4 minutes) until you pop into a room of a house. Go outside and you will see a fireplace of some sort. Go to it and you will see a weapon called "The Mace of Doom." This is the most powerful weapon in the game(if you have 6 Imperial Guards around you and you strike one of them with this weapon they will all burst into flames and die).
This weapon kills almost every enemy with one strike. Now go to one of the houses that was next to the one you just came out of. You will arrive in a dark room again and it will look like one of those rooms that Sigil Stones are in. Light a torch and go to the top and grab the sigil stone. This gives you about 40 of every kind of Sigil Stone in the game. You may want to drop most of them keeping only 5-10 each. Then walk out the floating door and you will arrive outside again. Feel free to look around as much as you want and explore things. If you do want to explore you might see an area of trees just floating in the horizon, walk towords them and it will appear that there it a huge castle in front of you. There are also houses and other things.
Step 5:After doing every thing that you wanted simply just fast travel to get out of this world
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