Speak to Harun Clearsky, who is found on Whisperwind Isle at (-560, -400). If he is not present, then summon him by using your hardened pipe reed obtained earlier in the quest series.
Travel to Blackwind Isle. A few feet away near the edge is a listening staff. Use your hardened pipe reed there. (-293,114,259)
Harvest 20 diamondjaw crawlers. These are unique nodes found all over Blackwind Isle.
Find the cart with ore on the back side of the island (-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.
Return to Bedziine. Summon him with your pipe reed if necessary. Speak to him.
Return to Harun on Whisperwind Isle. Summon him with your pipe reed if necessary. Speak to him to complete the quest.
Rewards
Coin
Completing this quest gives good faction with Windgazer