Can you tell how to do this quest please ? Because Im clicking on the tree but shadow dont appear I dont know why.

 PS: My english is not very good :/

I'm stuck on this too, I have clicked on both trees, all over them, and still nothing. I am a level 25 Night Walker and I'm still on the first Cygnus Knight mission :(

Alrighty, what you do is you go to "The Rainforest East of Henesys" (the same map you can find the mini-dungeon on) and walk along the bottom path, killing any monsters in your way. Go to the first pile of bushes you can click on(hover the mouse along each little "hump" of the path to see if you can click on it) and click them. You should see a little message appear you in your chatbox: "A suspicious shadow appeared!" and see a guy in a blue robe appear, then fade away. Despite it not saying so, this completes the quest. Hope that helps!

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"Chance has nothing to do with it child, the future is not determined by a throw of the dice, it is determined by the conscious decisions of you and me."- Phong, Reboot