To those into power leveling..., not sure if anyone else knows of this Options

[DarkEpyon]

There's a way to fight any given boss online as many times as you want in the same game.

1. Gather 3 other friends or willing participants.
2. Get to the boss you wish to do this on. (usually DF as he doles out the most EXP)
3. Have one person pipe back up and stay behind while the other 3 fight. (this 4th person is part of the key to the trick working)
4. Once said boss does its dying animation, the 3 involved in the fight must immediately unplug the modem cord from your system. (don't press start till the dying sequence is done or you won't get the EXP. Also, this is why the 4th stayed behind and didn't fight.)
5. Rotate between your team who stays behind and camps out (sometimes called the "room sitter") between fights.
6. Repeat as many times as you want.

If you do this with ultimate DF, I'm told you can garner upwards of 300-500k an hour if you have a stable team.