The Vale of Shadows

What places should I explore here?
I'm in Kresslack's tomb, but I can't get anywhere.
I keep getting killed by traps!
How do I open the big door in the room to the north?
How can I deal with Mytos?
Whoa, I got attacked by a nasty Shadow.
Where's the way down to the next level?
Whoa! I triggered a trap that summoned a bunch of skeletons.
Wow, I got into a room packed with skeletons of all sorts. Help me out!
How can I pull this lever?
There's a LOT of undead on level 3. How can I deal with them?
I found Kresslack. What should I do?

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