It seems I have to realign the light beam to resurrect Anephas. Which item do I need and where can it be found?

You need to line up the ornamental obelisks. There are squares marked on the floor for them.

Thanks. I found out in between. I always thought You have to get it to the next room where there's a whole in wall/floor. Does this hole make some sense?

I never noticed anything happening with the hole. Also opened a small door than monkeys came out of but I couldn't go in. No idea what relevance it had!
From what I've read, there's been tons of secret treasure rooms that I've missed along the way.