Travel to Blackwind Isle. A few feet away near the edge is a listening staff ( -293, 114, 259 ) /waypoint -293, 114, 259. Speak to Bedziine Redstone, who can be summoned using your hardened pipe reed.
Harvest 20 diamondjaw crawlers. These are unique nodes found all over Blackwind Isle (look for Diamondjaw Crawler Nests).
Find the cart with ore on the back side of the island ( -755, 120, 263 ) /waypoint -755, 120, 263. Right-click to place the crawlers. If you travel south along the edge of island you will have very few mobs to deal with. You can no longer stealth all the way through this part of the mission as placing The Crawlers will make you visible again!
Return to Bedziine Redstone. Summon him with your pipe reed if necessary. Speak to him.
Return to Harun Clearsky on Whisperwind Isle. Summon him with your pipe reed if necessary. Speak to him to complete the quest.