What is the All Night Mask used for? I just got it because I wanted all the masks. Now I have them all and have beaten all the temples. What do I do now? I know I'm not finshed the game because there is still an empty space on the mask screen. You know when you press pause and you see all your masks. I know it's the Fierce Deity Mask or something like that and I heard you have to give away all your other masks to get it. Do I have to and if I do, if I go back in time will I get them back? Please answer my question.