Black Clouds...

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1. Talk to Hughes the Fuse in Orbis Tower<Hugh's Laboratory> and accept the quest.
   From El Nath → Snowy Hill → Orbis Tower <1st Floor> → Orbis Tower<B1> → Orbis Tower<B2> → Orbis Tower<Hugh's Laboratory>
2. The NPC takes 1 × [Storybook] Formula for Black Cloud when you accept.
3. Collect 10 × Dual Pirate's Propeller.
   • Dropped by Dual Ghost Pirate Lv 87 (60%) — Unbalanced Time
4. Collect 50 × Screw.
   • Dropped by Psycho Jack Lv 30 (0.70%) — Vanity Room, Study
   • Dropped by Giant Cake Lv 70 (40%) — Sweet Cake Hill 3, Sweet Cake Hill 3
   • Reward from the quest John's Pink Flower Basket
   • Reward from the quest Fuel for MT-09
   • Reward from the quest Technical Assignment
5. Collect 100 × Ink Bottle.
   • Dropped by Squid Lv 94 (60%) — Dangerous Sea Gorge I, Dangerous Sea Gorge II
6. Collect 20 × Steel Plate.
   • Dropped by Giant Cake Lv 70 (24%) — Sweet Cake Hill 3, Sweet Cake Hill 3
   • Reward from the quest Chris's Request
   • Reward from the quest Keol's Order #2
   • Reward from the quest Keol's Order #5
7. Collect 1 × Ventilating Fan.
   • Reward from the quest Building a Ventilation Fan
8. Collect 50 × Cog.
   • Dropped by Chronos Lv 37 (60%) — The Path of Time <2>, The Path of Time <3>
   • Dropped by Platoon Chronos Lv 41 (60%) — Lost Time <1>, The Path of Time <1>
   • Dropped by Master Chronos Lv 46 (60%) — Lost Time <2>, The Path of Time <4>
9. Collect 1 × Long-lasting Battery.
   • Reward from the quest Porter's Durable Battery
10. Return to Hughes the Fuse in Orbis Tower<Hugh's Laboratory> to complete the quest.