Serenade to Kaysa
Quest Location
Before you can start this quest, you need to complete The Hornist's Dramatic Escape, Honey, Bee Mine, Serenade to a Great Fairy, and The Flute Player's Plan.
If you have completed those quests, this quest can be started at Outskirt Stable, at -1427, -1262, 0032.
How to Complete the Quest
Near the Stable Trotters' wagon, there is a vehicle made of three Zonai wheels and a stone slab. Near it, there is a fourth wheel, and a steering stick. Attach the fourth wheel to the slab, making sure that its arrow points in the same direction as the three wheels that are already attached. Then take the Stable Trotters' wagon and attach it to the top. Finally, attach the nearby steering stick somewhere on the front of the stone slab or the wagon.
When the vehicle is ready, talk to Mastro and tell him to get in. Check on the steering stick to start moving. Carefully drive up the rocky road that Mastro showed you earlier (northwest of the stable tent). When the path curves to the right, follow the curve, and look to the right to see the Great Fairy's bud. Drive toward it, and when you get close enough, there will be a cutscene.
Quest Reward
Mastro gives you 100 rupees as a reward. You can also talk to Great Fairy Kaysa from now on to upgrade your armor, and all the Great Fairies can upgrade your armor to a higher level now.