Fierce Deity outside of Boss battles
Anytime on the first day (preferably as close to dawn of the 2nd day as possible), ride Epona onto Milk Road. Make sure the Fierce Deity mask is assigned to one of the C-buttons. Without getting off Epona, Z-target the owl and use it to save and quit. Immediately re-open your file. If you are not on Epona, then try again. If you are still on Epona, ride away from the owl a bit, then put on the Fierce Deity mask. The game will kind of screw up, and you will hear a strange, continuous, beeping noise, but DO NOT TOUCH ANY BUTTONS! Wait until the 2nd day, and the beeping noise should go away. Hold Z and press A. You should fall into the ground, then respawn off of Epona as Fierce Deity (it will take at least 5 seconds to fall into the ground and respawn).
WARNINGS: When opening your file again after using the owl, you have to ride away from the owl a bit so that when holding Z and pressing A later on, you finish the cheat instead of just using the owl. If you touch any buttons before the 2nd day, when pausing, the game will freeze. If you go into Clock Town, the guards will not let you back out, and you can't take the secret tunnel to the Observatory. If you go into a building other than the Milk Bar, you can't get back out. You cannot take the mask off, and there is no known way so far to stop being Fierce Deity without turning the game off and on again.
GLITCHES: Hold Z inside a building, and the blue glow will appear even though your sword is gone. Hold are, and
Fierce Deity's arm will be used as a shield.
Added by: Guest Jun 22nd 2011, ID#6565