Witchaven/Level 5

From the start, head straight forward to the north along the bridge until you see the third door on the left, then jump into it to find a tomb of sorts. Pull the chain on the wall and enter the passage that opens to find the pentagram.

Now return to the bridge and continue following it north to another pull chain. There is a bug in this map which prevents the chain from working, so barring the use of unofficial patches, you will have to use an Open Doors spell on the grey stone wall beyond it. When the passage opens, go inside. Upstairs you will find the brass key which will open the door to the exit.

You may now wish to explore side areas for more equipment and experience, or go for a quick finish by heading back to the bridge and going directly east to the exit chamber. It is guarded by a Grey Witch who is quite a bit tougher than any monster you've encountered previously.

Bonus Areas

 * The prison areas directly to the sides of the bridge near the start contain an adamantine ring and a bow. They are also laden with poison arrow traps, which might not actually cause you any damage.
 * Exploring the set of prison areas slightly further north will gain you potions and a leather armor.
 * On the way to the pentagram chamber, you can find a sapphire ring. In the room across from the one that leads you to the pentagram is another leather armor.
 * The northeastern room contains an ornate horn and hero time helmet, but beware of fireball traps.
 * The northernmost room is guarded by another grey witch, and contains a strength potion, health potion and two treasure chests.