To complete this quest you need to have done Usher Talltree's quest "Pandora's Box" WITHOUT reading his letter (The puzzle WILL NOT work if you do the quest incorrectly). Once you turn in his quest you will receive the collectable "Origin of The Brotherhood" if you look at the collectible there will be a picture in the top right corner representing the room before Usher.
The picture will have 4 symbols (Diamond, Square, Fish, Circle), one in each corner. Every playthrough will have the symbols in different placements but the solution is the same.
While other collectible's written by usher have the order in which you press the symbols you do not actually need them.