Hey everyone. Ok, dumb question, but how do I find Toona Sanctuary?

I'm in the post game after the normal ending. and need to get to the Celestial Society to find Lloyd. I remember something about that from early on, but can't figure out how to get there.

Sorry, I should have specified. I'm getting nowhere in Berilath. I get to the room with all the moving arrows, like conveyor belts, and was able to get to the one treasure with a potion spray, but cannot figure out how to get anywhere elase, other than back out again

 

I'm completely stuck there

too. I was able to get as far as the first treasure with potion spray, but I can't get any farther. I can get back out, but cannot get to any further rooms, no matter how many ways I try to use the conveyors  on the floor