Yes. I’m working on getting that on my first moon trip. The fierce diety mask, but it’s obvious I consider that the ultimate last mask. The last mask I need to get it is the lovers mask which I get from the Anju Kafei quest which I always do right before entering the moon within the same timeline. I mean, I had to do a bit of it to get the keaton mask and postmans hat but I didn’t finish it. I was saving it for last because it is by far the absolute best side quest in all of zelda.