The Abandoned Tunnel

Nested hint: As soon as I walk in, the door closes and it's pitch black.
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Hint: The lamp works great, but then it breaks when I trip.

Nested hint: There's an elevator at the end of the tunnel, but it's broken.
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Hint: I've taken the elevator; what's to do in the Cepheid tunnel?

Nested hint: I'm blocked by another monster!
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Hint: Londie has appeared again.

Hint: Should I use the River of Light in this cavern?