Twad said:
MAgic in oblivion, followed by everything else in the game.
Strictly speaking, Illusion magic. This is my 'How To Win At Oblivion' guide;
- Get the invisibility spell
- Get some sneaking skill
- Get a sword
- Go invisible, get behind monster, crouch, hit monster with sword. The critical from sneak will give a 6x damage modifier, and even if they don't die, you're behind them and still sneaking so they'll just stand there wondering what hit them. Then you hit them again.
Seriously, I did the entire Arena questline in about half an hour this way.