Thread:CardBoss14/@comment-24974599-20150527034238/@comment-24019770-20150711024642

Oh! An Emerald Dragon Rune?! :D

Those are incredibly helpful! You use it at the Shrine where your Dad works (to the left of Ranger HQ) and you fight the Jewel Dragon of the element inscribed on the rune. In this case, it's an Emerald Dragon- a Wood type enemy.

They have high defense and flee if not taken care of quickly. Defeating them in battle yields 3,000 experience for your team.

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They also may drop their eggs, which you can then sacrifice to the ATHENA machine to "feed" experience to your monsters (ATHENA is unlocked after a certain point in the story).

If you feed an Emerald Dragon's egg to a level one Wood element monster, it will bring it up roughly thirty levels.

Any other monster will be at least a very small amount for those closer to level 99 and about ten or twenty levels for any monster lower than 50.