Spider Temple. Yep, I completed it in one day. First, I found the first crystal.

The second one, I ripped off the wall using telekinesis – look at the walls! This is a hall where there will initially be many, many zombies. There is a partially destroyed staircase leading down, and at the very bottom, there is a lone Spirit. Somewhere near this spirit, at the bottom, you need to persistently look up. Eventually, you'll see a few wooden beams that you can hook onto with your bow and proceed further.