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Speak to Instructor Tong at Windward Isle in the Jade Forest. The entirety of this quest happens in The Jade Forest.
Upon completion of this quest you will gain 710 experience, 500 reputation with Order of the Cloud Serpent and will be able to choose one of these rewards: Blue Serpent Egg, Green Serpent Egg or Yellow Serpent Egg.
Here you can buy Choosing the One Boost for EU or US Servers.
You'll get guide for completing Choosing the One Boost