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Theres a couple spots in the imperial sewers where you can autowalk into a corner between a doorframe and a wall, on the other side of the door theres a stationary mudcrab(2 stationary mudcrabs and 2 spots to powerlevel), with that in mind I was able to powerlevel a fresh new character to 100 sneak from 35...

It got me from level 1 to level 7, and from 45 agility to 75 agility through all the level ups. O_O

Yeah... Powerleveling in oblivion is so broken, especially for sneak.