Can be found in Academy of Raya Lucaria. You enter this place from the South Raya Lucaria Gate, using the Academy Glintstone Key, then go through the Academy and defeat the boss “Red Wolf of Radagon” to reach the Debate Parlor. From the Debate Parlor Site of Grace, head straight to get outside. Then immediately turn right, go around the corner and jump to the balcony. Take the ladder up and on the big balcony you can find it in a chest.