Rogues can solo DM North tribute runs. You can solo this all day and control prices on aces and books, not to mention some decent gear for your runs. It does require having the engineering world enlager. This will shrink your size and aggro range allowing you to stealth pass the dogs. While stealthing through you can open dusty tomes. The key to soloing the king is a bit tricky. It requires you to solo pull him from his guard. The only way you can pull him alone is in one direction only. Pulling him from an angle of the second pillar to your right. The exploit here is toward the front of the stairs the king will get stuck, he will not evade, but will hit you if you are too close. Using a ranged weapon (and alot of time) you can easily solo the king and have all the loot to yourself.