So after you kill the Queen (right before the second bell) and you entire down from ringing the bell, there is a secret wall there.

You must hit it, enter in and talk to the man who has eggs on his back, say yes and move into the room.

You are then greeted to the right of you with what seems to be the now, run down, drained Queen herself, who can reinforce your estus flask.

You're also given the answer to talk to her (which she says nothing) or join a covenant.

Does anyone know what this covenant is? And what happens if you kill either of them?

This music and everything is bugging me out too, I love it.