The Temple Ruins Version 2.3.1

Moon Pearl
- Location: Tower of Hera
  
  How To Acquire: The Moon Pearl is located in the big chest inside the Tower of Hera. However, this chest is harder to reach than most. The Tower of Hera is made up of several floors and on each one are many holes (many which disappear and reappear if you hit small star switches). If you fall in these holes, you will fall down to a lower level (sometimes you’ll fall through multiple holes and go a few floors down). You must take advantage of this to reach the Moon Pearl.
  
  Go to the floor just under the boss (Moldorm). On the left side of the room (where you enter) there is a star switch. If you hit it, the holes in the room will rearrange. Now, find the hole in the center of the room, closest to the top wall. Fall into that hole from the top side. If you do it correctly, you will drop right in front of the chest. If you fall into the hole the wrong way, you will hit some star switches and close the path to the chest and have to try again.
  
  Uses: You cannot equip the Moon Pearl but you will be using it for most of the game. If you do not have it, then you will turn into a rabbit whenever you enter the Dark World (you do this once before entering the Tower of Hera). Once you have it, you will retain your human form.