Demon Arm

Demon Arm comes in 2 variants :
 * 鬼の左腕 - Left Demon Arm
 * 鬼の右腕 - Right Demon Arm

Both arms are always next to Ibaraki Douji during the boss fight. Killing Ibaraki Douji before the arms will result in the raid quest battle to end, resulting in lesser number of possible obtained at the end of the quest.