The last Boss has a weapon called the Holy Win, that is in the shape of the "Rood". You also can get this weapon. During a replay game, enter the Iron Maiden and defeat Asura on the third floor. Next, go back down the Iron Maiden until you get to the door to the second floor. Now, use magic or Break Arts to lower your HP to below 150. Then, enter the second floor. You have new enemies to face, so be ready. When you get to the room that takes you to the third floor, you will see an enemy holding the weapon. Kill him and you may get it. If not, go to the third floor and back to try again. Remember to keep your HP under 150 and use Break Arts as needed.