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True Emerald Dragon

Find and defeat the Emerald Dragon on Emerald Dragon Island, then report to Harkas.
 

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Introduction

Harkas told you that simply finding the Emerald Dragon is simple, but it will be no simple feat to actually defeat it. The power Muto felt in Atlantis is in fact thousands of years of rage distilled into one being.
You should make sure you are truly prepared before you approach the Emerald Dragon.

NPC Dialog

It's difficult to say where the Emerald Dragon may appear, but finding him is the easy part. I'm sure you can feel for yourself the overwhelming energy that creature posesses. That is the energy of thousands of years of rage, distilled into a pure form. Approaching such a force would not be a smart idea.

Quest Completion

You actually managed to defeat the Emerald Dragon? And then it just... disappeared? This is perturbing. What will we do now with the Emerald Dragon gone? What meaning is there left to our existence?
...well, you've done what you came here for. Please, leave this place.