normal sphinx
There should be a bookshelf door that can act like a secret entrance by pulling on of the books out or and empty bookshelf you press a hidden button on the side or you can activate it by using wiring and, add a bookshelf monster that if you open it it jumps out grabs you and pulls you in and die.
earnest yacht
this is sick
normal sphinx
Sorry for being sideways but this is what it looks like when it opens. The reason that the blue book is so big is because it is like the book that opens the door.
vague citrus
Instead of a monster it should just fall on you