The Plume of Alystros (quest)

Objectives
Nishera the Garden Keeper at the Emerald Dragonshrine has asked you to acquire The Plume of Alystros. Provided Item:
 * The Plume of Alystros
 * Skytalon Molts

Description
I can feel that the shrine is not completely back in balance. The verdant keeper has been angered by our actions and I sense that he will not listen to reason.

Alystros is an immense skytalon who perches at the south end of the Emerald Dragonshrine. It is he who is in charge of the dragonshrine's aerial defenses. I fear that we will have to deal with him.

Take these skytalon molts and place them on the ground where he can see them. He will come. Bring me his plume.

Rewards
You will also receive:

Progress
Have you managed to deal with Alystros? The verdant keeper is very powerful.

Completion
Do not weep for Alystros. He has dedicated his eternal life to the defense of the Emerald Dragonshrine and will be reborn.

Hopefully when he returns to us, he will not be gripped with the confusion of the Emerald Nightmare that seems to have taken hold of The Dreamer.