Special thanks to Xaimill for testbuilding this model for me.
The mask Link obtains by defeating the Gargantuan Masked Fish, Gyorg, in Great Bay Temple. Gyorg's defeat releases the Giant of Great Bay, allows the murky and unnaturally warm waters in the bay to begin returning to normal, and dispels the vortex that surrounded Great Bay Temple. At this point, the Fisherman will also run a jumping mini-game on Fisherman's Island.
Download at PaperZelda
Also, to make you excited, here's a sneak peek at the craft I've working so hard on.
Majora's Mask battle-ready pose link. Will include instructions and all the weapons.
Hopefully will be released next week.