The mystical smoke emanates from a fantastical concoction known as "Pixie Dust Elixir." Created by the most skilled alchemists in the land, this elixir serves as a magical energy source that propels the truck and its entire caravan on their aerial journey. Infused with the essence of ethereal pixies, the Pixie Dust Elixir allows the truck to transcend the boundaries of the mundane world and soar through the skies with grace and elegance.