Origins 2nd quest (what to do)

[Alucard15]

I i got a question about level one when you get in the room with the blue boomerang guys there are 4 of them and once you kill them nothing happens what do i do is there something in the last room i was in or what?

[Happo]

There should be a brick sticking out to the right of the door. Use the boomerang to hit it.

I have a question myself. I'm stuck in level two and I can't find the big key. Also there is this room with two crystals sticking out above two armos statues along with a second door that is closed. How do you get this door open?

[Blackbun]

I'm stuck on the 2nd level too. Maybe a bow?