Thieves' Maze

• You won't be able to access the Thieves' Maze until chapter seven, at which time you'll be able to enter the maze through a staircase in the Thieves' Guild. The initial few enemies in the maze aren't too tough, consisting of various types of oozes and similar creatures. Start moving slowly once you hit the doom guards, however, as they are tough opponents, and you definitely don't want to get too many of them onscreen at once.
  

  The dangerous Thieves' maze. Look out for the Skeleton Warriors in the NE corner of the maze, in particular.

• After you pass a couple of doom guards, you'll have to face some fearsome skeleton warriors in one of the toughest battles in the game. There are two skeleton warrior archers waiting down a corridor made dangerous by a series of lightning and fireball traps. The skeleton warriors are virtually immune to magic spells (90 percent magical resistance) and their arrows act like arrows of fire, even though they are not magical. Send a thief (hasted or wearing boots of speed) up the corridor to disarm the traps (you can disarm the first couple before you'll encounter the skeleton warriors) and then flee back down the corridor to try to lure the skeleton warriors back to your party, one at a time. You can ambush the skeleton warriors when they pursue your characters around the nearby corner. Fighters using maces or other blunt weapons works best against the skeleton warriors. You can also use animated undead of your own, or summoned monsters, to draw the fire of the animated undead.
  

• There are several additional traps in the maze, so continue to use a thief to scout the maze. There are some invisible stalkers and additional skeleton warriors, but none of them has a ranged attack. Your thief, equipped with boots of speed, should be able to take them all out alone, using stealth and backstabbing and constant retreats, but if you want to speed things along, have your other characters help out with the invisible stalkers at least, since they are vulnerable to most offensive spells.