You need to find the Serpent Master, and talk to him (or Kill him). You get the Skull key from him, and I think you take the elevator on the right. Anyway, you will know it when you see it, because there will be a lever, and a lock in the wall. Use the key on the lock, and wander around aimlessly until you find the exit. I found the easiest way to get out is from the room with the big serpent head where you summon the naga.
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