Secret Mission 22
(VS. Khroma. Downed her by timing your strikes between certain of her attacks.)
Please refer to ????????????(Secret Mission 1) for more information on Secret Missions in general.
For this Secret Mission, you have to hit Khroma, once rocks start falling down. Then she is flying through the air and she slams the ground. Sometimes the Secret Mission counts after hitting her right away, sometimes after she has slammed the ground. Either way, this Secret Mission is hard to miss and you will most likely get it without even trying.