To accept this quest, talk to Kirtida at the Dancing Peacock. "That request is from a member of the Carpenters Guild. He wants a tree root to be used in a construction project. He specified that he wants the root to come from a tree that grows in a very windy area. Tharsis has strong winds, but if he is posting a request to explorers, I must assume they are not strong enough. Have you come across any such place in your travels? Well, I shall await your swift return." Once you collect the root, return to the Dancing Peacock and talk to Kirtida to claim your reward.