Spill Mountains Passage System is quite a big place. I'm not going to draw a map of this one as it would be uselessly huge and confusing. 
Let's discuss terms:

east - go to the right
west - go to the left
down - take a ladder down
up   - take a ladder up
south - walk downwards
north - walk upwards
Mostly it's obvius where Seeker should go so I'll only point out those doubious "forks" where you have to take decisions. You should obliterate all incoming blighters, that goes without saying. 
Allright, let's get started:

exits -  go there
=================

east
*west - east
up

north
east - north
*west

*south
east - west
west   

It's a dead end but you have to visit it anyway to get
                       ride of the vampires

south
east - east
*west 

east
west - west   
*down

Another dead end

east
*west - down
down 

south
*east - south
west  

west
east - west
*north

up
*east - up
west 

north
*east - north
west 

up
*east - up
west 

south
*west - south
down 

north
*down - north
east

up
*south - up
down

south
*west - south
down 

west
east - west
*north 

north
east - north
*west 

east
west - east
*north     

Yet another dead end

west
*east - west
north 

west
*east - west
north

east
*west - east
north 

south
up - south
*east

west
up - west
*north    

Err.. almost final dead end

north
up - north
*west 

up
east - up
*south 

east
west - east
*down     

The final dead end

west
*east - west
down    

Here it is, the fabled gem. Crack the code
 and grab gem. Take one of the scrolls also.

Now we have to get out of here. BORING !

down
east - down
*west 

east
*up - east
south 

north
*east - north
west

west
down - west
*south 

down
*north - down
east

west
*south - west
down

east
*up - east
west

east
west - east
*north

west
*up - west
east
You should be all clear by now. Return to the Leader and tell her all about your perils (give scroll to her).

End of the Seeker's Quest.

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