Actually, there's no need to overthink it. When he had the system before, he always struggled with the lack of magic techniques for escaping, often finding himself in dire straits. Now, the trials are even more so. For example, the God of Filling the Sea wanted him to go to Dark Moon City, but the last time he went to the Eternal Night City of the Demon Realm for his trials.
He couldn't even figure out the direction. If he had to walk slowly on his own, it would have been too late. Therefore, the first priority for Foundation Establishment stage cultivators is to master a reliable escape technique. Currently, his escape technique is "Immortal Travel." He can be fast if he wants, but he must use a massive amount of spiritual power to build it up.
Could we develop a magic technique that is both fast and doesn't consume too much spiritual energy? After all, once I enter the trial, my spiritual energy only flows out and doesn't flow in. Consuming too much will inevitably make it extremely difficult to complete the trial mission.
After pondering "Immortal Travel" for a while, and recalling some speed spells he had seen before, Wang Yao finally came to a conclusion: to possess the upgraded version of the speed spell mentioned above, one must rely on external objects for acceleration.
For example, the ferocious demon has a pair of wings that help it fly, and the old immortal Tongxuan cut off a flying donkey and rode it himself. Of course, powerful beings like the Mad Demon, the Fairy Maiden, and my cheap old father Ao Guang don't seem to need to rely on external objects for their speed and magic.
However, the Mad Demon was already a Nascent Soul level expert, so his techniques were naturally a cut above the Fiend Demon's. As for why the equally high-level Tongxuan Old Immortal would use such a seemingly low-level immortal technique to embarrass himself, Wang Yao thought it was just a low-level hobby of immortals, deliberately showing off.
For Wang Yao, who had only reached the Foundation Establishment stage, it was obviously unrealistic to expect him to master speed techniques that did not rely on external objects. He was already quite satisfied with simply being able to ride a donkey quickly, just like Tong Xuan.
However, although Wang Yao had already mastered the "paper puppet" at this time, there was a difference between Tong Xuan's flying donkey and the "paper puppet". The "paper puppet" that Wang Yao made did not have the function of acceleration, so it was very necessary for him to research a device that could accelerate so that he could ride it.
The first question was how to achieve the acceleration function. Of course, this couldn't be achieved by simply accumulating spiritual power, as that would be no different from "immortal travel." After studying it for a while and combining it with his experience before his transmigration, Wang Yao quickly figured out the reason behind it.
It's nothing more than the principle of a rocket engine. It uses combustion to expel a powerful jet of air backward, generating a reaction force that propels the rocket into flight. However, rocket engines are incredibly complex, with things like turbines and pumps. Wang Yao doesn't have that kind of professional knowledge, but he does have spiritual power!
With spiritual power, there's no need for burning, because the purpose of burning is simply to generate reaction force, and spiritual power can also generate reaction force. He can completely use spiritual power to simulate an air intake and exhaust device.
Just like inhaling and farting, it is used to generate a reaction force that propels itself forward.
Although inhaling and farting don't generate much power, it's only carrying Wang Yao, a celestial being, so the power doesn't need to be too strong. Wang Yao is confident that, based on Tongxuan's donkey, he should be able to use spiritual power to construct a device that inhales from the front, pressurizes the stomach, and exhales from the back.
This device needs to maintain a relatively fast and constant speed while consuming only a small amount of spiritual energy. As for wanting it to be even faster, then just use more spiritual energy to create more. A fart released with a massive amount of spiritual energy will definitely be incredibly powerful!
Having figured out the principles of how magic works, the second step is to use spiritual power to construct such a thing. Designing something completely new that you've never seen before is obviously too troublesome. The simplest and most direct way is to directly copy what you've seen before.
The internal structure can be copied from Tongxuan's donkey, but as for the appearance... In the end, Wang Yao's question became, what kind of thing should he choose as his mount?
His first thought was a horse, but he immediately rejected it. Tongxuan rode a donkey, and I rode a horse? It was so uncreative! Besides, General Shan and General Pei of the God Realm also rode horses. Wouldn't I be no different from those guys in the God Realm?
Then he thought about getting a pair of wings. All the fully evolved powerful beings in the demon realm have a pair of wings, some dazzling and some inconspicuous. Why don't he also get a pair of wings to carry on his back? When he flies, his wings spread out, and he looks really cool.
But he quickly abandoned this idea, for the same reason as before: he lacked individuality! No matter how strange he made his wings, there would probably be similar species in the demon realm. He, a dignified immortal, could not possibly look like those monsters.
After much thought, Wang Yao recalled that before he transmigrated, many people in his world loved riding electric motorcycles. The streets were teeming with them, and cars would give them a wide berth. They were incredibly domineering.
Electric motorcycles are great. I haven't seen a single powerful being in the Six Realms riding one of these things. They're quite unique. Besides, electric motorcycles aren't that big. You could easily make a folding one. You can carry it in your pocket when you need it, and just take it out, unfold it, and go. It's just like Tongxuan's donkey. Convenient!
Another point is that Wang Yao's mastery of this speed technique is not yet perfect. Constructing a device with spiritual power is not feasible if it is too small. The effect that Tongxuan can achieve with a piece of paper the size of a palm is something Wang Yao knows he cannot do yet.
Although he still had a few donkeys made of Tongxuan scissors to imitate, the Tongxuan technique was a more advanced application at the Nascent Soul level and above, and could not be simply copied.
This is like asking a few recent mechanical engineering graduates to disassemble an airplane engine. Even if they can take it apart and understand the structure of all the parts, it would be too much to ask them to replicate it exactly.
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