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The crafting of the Space-Breaking Shuttle is a closely guarded secret, and few in the Immortal World understand the method, making every shuttle exceedingly expensive.
In the secret land left by Qi Jingshen, Feng Wanli once found the crafting method for the shuttle on a pillar, and by now, he must have passed it on to the Taoist Mysterious Sect in the Immortal World.
The legacy left by Qi Jingshen naturally included the method for crafting the Space-Breaking Shuttle.
Seeing Li Cheng arranging the materials, Immortal Emperor Tianyuan reminded him, "The internal space of the Space-Breaking Shuttle should be crafted larger, preferably able to accommodate tens of thousands of people at a time. With the pulling force of spatial wormholes, three days would be enough to make a one-way trip, so crafting six shuttles should suffice!"
