Entry Drain and Tree

I keep falling in the monster pit!  How can I avoid this?
Can I destroy the monster?
Where am I supposed to go in the tree?
How does the kitchen oven work?
How can I get through the clock pendulums?
What is expected of me in the plant room?
Where does the lift elevator go?
What does the door want?
Where is Shield 3?
How do I get back to the Orrery with Shield 3?

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