In Resident Evil DS what do you do after you get the 2 doom books?

What you need to do is open them up. In order to open them up, you need to examine them in your inventory screen. Just press the Y button to get there. Next, use the Control Stick/D-Pad and the C-Stick to turn it to the point where the pages are facing the screen. Then, press A and you will get the Angel Wings and the Devil Wing. Combine these with the Angel Statue (the white one) and the Devil Statue (the black one). After that, set both statues on the balance and a new path will be revealed. The rest is up to you to figure.