Fly to The Cloudmist Isle and summon Chesem Sharpeye ( -593, 244, -193 ) Copy/waypoint -593, 244, -193 with your pipe reed. Speak to him when he arrives.
Harvest three 'Trapped Wind' from around ( -597, 248, -145 ) Copy/waypoint -597, 248, -145, which will automatically turn into A Sentient Wind Essence in your inventory.
Go to The Isle of Eaglewatch and run over the indicated locations on the western, eastern, and southern edges of the island for automatic updates. The locations are obvious, indicated by a small cloud on the ground and a faint rainbow above them.
Return to Chesem on Cloudmist Isle. Summon him again if necessary.