This is also related to some things Xiao Yan discovered during the development of his devil fruit abilities.
Xiao Yan is not a scientist like Vegapunk, he is a possessor of certain abilities, a beneficiary of nine years of compulsory and advanced education on Earth, and has a good understanding of the plot.
By carefully observing the specific changes in the body during the use of the Devil Fruit, and by mutual confirmation with Eneel, you can still discover a lot of interesting things.
Of course, since both of them are users of nature-related abilities, everything they discovered is related to nature.
For example, in the process of using the fruit power, Xiao Yan discovered that the ability of the natural devil fruit to create elements is not endless. In simple terms, taking Xiao Yan as an example, although he has the Flame-Flame Fruit, it is not surprising that he can use the Flame-Flame Fruit to produce endless flames.
This process is more like there is a substance in his body.
Xiao Yan combined the description in the plot and named it: bloodline factor.
This bloodline factor can convert the physical energy in his body into flames. The more flames converted, the more energy is consumed. This also explains why the stronger the body, the stronger the devil fruit ability.
This seems to be a flaw, but on the contrary it proves that the upper and lower restraints of devil fruits are not absolute. As long as the user is strong enough, he can completely ignore this restraint.
This also provides a way for the devil fruit's abilities to advance, even to the final awakening.
For another example, Xiao Yan discovered that the essence of the elementalization of the nature-type Devil Fruit ability user is not to transform into elements to avoid attacks, but to control the flow and changes of the body.
To put it simply, it is a user of the Nature-type Devil Fruit ability who can transform his body into elements and then, like water, flow and transform his body at will in the created elements.
This may seem like nonsense, but it proves a problem, that is, the user of the nature-type devil fruit ability is not without substance during the elementalization process, but he is like water, hiding his body in the elements by changing his body, making it impossible for physical attacks to harm him.
This also explains why Haki can cause damage to the natural system.
The user of Haki can use Observation Haki to find the location of the Devil Fruit user during the elementalization process, and then use Armament Haki to catch him.
This may also explain why some natural-type abilities are not afraid of Armament Haki. As long as the location of the ability user's entity cannot be found, even if the ability user has Armament Haki, the natural-type ability user's entity cannot be captured.
As for the ability user with Armament Haki, how did he catch the elemental ability user who was flowing like water? Since Xiao Yan has not awakened Armament Haki yet, it is unknown.
But Xiao Yan had a guess that there were only two ways to catch water: one was to turn water into ice, and the other was to use water to catch water.
Xiao Yan believes that the two points discovered above are common characteristics of natural devil fruits, of course, the Dark Dark Fruit is an exception.
Then, the next interesting thing Xiao Yan discovered was that it might only be suitable for devil fruits like the Flame-Flame Fruit, the Thunder Fruit, and the Sparkle Fruit.
These three fruits have one thing in common, that is, the elements they create, such as fire, lightning, and laser, are pure energy, unlike other fruits known so far, such as ice, magma, sand, smoke, etc., which are tangible.
Absolute entity.
This made it more difficult for these three types of fruit ability users to be captured by domineering power. At the same time, it gave Xiao Yan a new idea.
This is also related to Xiao Yan's attempt to develop the Six Naval Styles on his own.
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Since we have come to the world of One Piece, before we master Haki, it is natural that we should master useful physical techniques like the Six Styles of the Navy as early as possible. Moreover, there is a rumor that the Six Styles of the Navy is the basic version of Haki.
Of course, Xiao Yan gave up in the end. It was not because he could not develop it, but after thinking about it carefully, he found that there was no need to waste precious time on it.
Because he found that, for now, the Navy Six Styles were a bit useless to him.
The Six Styles of the Navy are divided into six major moves: Shaving, Iron Block, Paper Painting, Moon Step, Storm Kick, and Finger Gun.
But when Xiao Yan thought about it carefully, he found that except for the instant teleportation skill of shaving, which was somewhat useful, his devil fruit had all the other five major moves.
First of all, Iron Block and Finger Painting are not as useful as Elementalization. As for Storm Kicks and Finger Gun, Xiao Yan can use the Devil Fruit to show the same effect. As for Moon Steps, he can use the Flame-Flame Fruit to fly.
As for Enel, it is even more unnecessary. No matter how fast the shaving ability is, it can only be as fast as the speed of lightning. In some ways, Enel's Thunder Fruit is more versatile than Xiao Yan 's Flame Fruit.
Therefore, instead of spending a lot of time on these somewhat useless physical skills, it is better to spend this time on developing the fruit and strengthening the body. When you arrive in Qinghai in the future, wouldn't it be better to just rob it directly from there?
However, although the Six Navy Styles did not need to be developed, when Xiao Yan thought of the Six Navy Styles, he remembered another very interesting skill, which was: Life Return.
The ability to restore life first appeared on the Judicial Island in the hands of a lion-like guy. Through the ability to restore life, he can control any organ in his body at will, such as hair, internal organs, limbs, muscles, etc.
In addition, in subsequent plots, the return of life also showed effects such as quick digestion of food, recovery of physical strength, storage of energy, and accelerated healing of wounds.
So, an idea came to his mind: could he use the ability of life return to transform his body and make himself stronger and stronger?
Although Xiao Yan has made his body countless times stronger through hard training, he also understands that he is still far behind these monsters.
However, there is a problem, he does not know how to return life, and he does not know how to learn and master it. However, he has the Flame-Flame Fruit.
This is also why we mentioned the special features of the Flame-Flame Fruit, the Thunder Fruit, and the Sparkle Fruit earlier.
They can transform their bodies into pure energy, but the way they express it is different. So, can I transform this ability a little bit and return it as another kind of life?
After all, for a user of the natural devil fruit ability, although he cannot change external matter so far and it is still uncertain whether he can convert it into elements, Xiao Yan can still control his own body, which naturally includes the food he eats.
So, after having this idea, Xiao Yan spent three years carefully trying step by step, and finally he developed it. He called it: Nirvana.