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Fractured crystal 2 detail

The vertical fractured crystal is an item used in Mourning's End Part II. It is the second fractured crystal obtained in a chest during the quest. It used to open the cyan and black doors. The fractured crystals act like prisms and allow a beam of light to be split into two separate beams. Each crystal splits the light in different directions and must be used in a specific combination in order to be able to solve the puzzle.