Follow the passage around a ways, both indoors and
outdoors, until you reach a large room and the
passage behind you is blocked.  Kill all of the
undead.  Your hit points and spell points will be
drained in the entire level, so work quickly.

The exit is through a passage that begins at (28,24),
but it is blocked by stalagmites.  The sign in the
middle gives a clue on how to remove them.  Use the
runed stone.  Head down only the passages marked
by runes, and retrace your steps to the middle
chamber once you find a lever.  Although the sign
says you have to pull the first lever twice, not pulling
it at all will achieve the same effect.

Passage at:	Lever at:

(33,24)		(58,19)
(37,32)		(54,26)
(30,37)		(32,48)
(27,37)		(22,49)
(23,25)		(22,5)
(33,24)		(58,19)

The last lever is a repeat of the first level, if not 
skipped.

If the levers are correctly pulled, only one time each,
in this sequence, the passage at (28,24) should be open.
Leave this place, stopping to pass through a secret door
behind the rune at (35,9) to pick up some much needed
supplies.

If you waver off of the path too many times, you will be
sent to an underground lake below this level, where your
only option will be to row out and go back to the 
beginning of the Spine.