The Green Dragon, also known as the Green D. or GreenDragn, is an enemy from Final Fantasy IV. It is found in the Tower of Babil, usually encountered as a Mystery Egg, which will hatch a random monster if enough time passes, one of them being the Green Dragon. It can also be encountered in the area outside the Sealed Cave, should you have missed it in the Tower. It drops the rare item Green Tail in the 3D versions, which can be traded for an Onion Helmet at the Adamant Isle Grotto. In the NA version for GBA, monsters that hatch from Mystery Eggs will count only as Mystery Eggs, so you can find this monster (without hatching from the egg) in the Lunar Ruins, in one of the floors that looks similar to one of the Tower of Babil (the one that in the Lunar Ruins has a chest 4 squares to the right from the exit).