In order to find clues about his father's accident, Han Sen had read a lot of relevant materials, and he was naturally familiar with his father's handwriting.

Han Sen was sure that on this piece of paper, it was his father's handwriting.

However, forging handwriting is a very simple thing in this era, and what really surprised him was what was written on it, many things that only he and his father knew, which made Han Sen have to believe that this letter was written by his father.

At the end of the letter, he also said something that surprised Han Sen even more.

The pill furnace and the pill inside that the blind man gave to Han Sen before were indeed what Han Sen's father gave him, so that Han Sen must eat the pill inside before he was promoted to a demigod, because the pill inside could help Han Sen open a special shackle in his body.

That shackle is not within the ten genetic locks, but its importance is definitely not under the tenth genetic lock, and it is also of great benefit for the promotion of demigods.

This surprised Han Sen very much, the effect of this elixir seemed to coincide with the other genetic lock that the Dragon Emperor said, it sounded very amazing.

After that, there were some words of sorry for their mother and son, etc., but now he can't come back, otherwise it will bring big trouble to Han Sen and their mother and son.

After reading it, Han Sen's face changed.

He somewhat believed that this was his father's letter, but Han Sen was used to being independent, and all these years of birth and death had made him maintain a strong sense of vigilance about everything, even if the medicine in the Dan Furnace was really given to him by his father, Han Sen had to figure out the origin and authenticity of the pill before he dared to eat it, not to mention that it was just a letter, and he was not 100% sure that it was true.

However, the letter mentioned a method that could test whether or not the shackles were opened, and it was not too troublesome, Han Sen thought about it, and was ready to find a few powerful alien spirits to try and see if this method really worked.

Moreover, the method mentioned in the letter actually used the Nine Lives Blood Cat Pendant as a testing instrument, which also made Han Sen wonder if the Nine Lives Blood Cat had this effect.

It's just that Han Sen can't find anyone who is sure that he has opened that shackle now, so what he can see is probably only the failed test results.

Not daring to test it directly, Han Sen summoned the Empress of Moments to come out and let the Empress of Moments drop a drop of blood into the mouth of the Nine Lives Blood Cat.

Han Sen had never made such an attempt before, seeing that drop of alien spirit blood dripping into the mouth of the Nine Lives Blood Cat, the small mouth of the Nine Lives Blood Cat obviously had no gaps, and it was full of solid crystals, but that drop of blood actually flowed into the mouth of the Nine Lives Blood Cat strangely, and it was also strangely sucked into the solid belly of the Nine Lives Blood Cat Pendant.

After a while, Han Sen's eyes widened, and that drop of alien spirit blood gradually turned blue in the belly of the Nine Lives Blood Cat, and that blue blood gradually spread, and finally dyed the entire Nine Lives Blood Cat pendant blue.

After a few moments, the blue color of the Nine Lives Blood Cat pendant gradually faded, and finally completely returned to its original blood red, which was exactly the same as the result of not opening the shackles mentioned in the letter.

If the shackles are opened, the blood will not turn blue, but will remain pure red.

However, Han Sen was not a person who would easily believe anything, he found other alien spirits, alien creatures, and even asked for blood from human transcendents, and repeated many experiments.

The result was 100% accurate, no matter what color the blood of those alien spirits and alien creatures was, after the result dripped into the mouth of the Nine Lives Blood Cat, it would be absorbed and turned blue, without any accidents, even the blood of the Empress.

Han Sen also dripped a drop of his own blood into it, originally he thought that his own should also turn blue, but after a while, his blood melted inside the Nine Lives Blood Cat, and instead of making the Nine Lives Blood Cat turn blue, it exuded a blood-red brilliance.

Han Sen was stunned for a moment: "What's going on? According to the test method mentioned in the letter, this should be the reaction to opening the shackles, when did I open the shackles? Or is there something wrong with the test of the Nine Lives Blood Cat?"

Han Sen couldn't believe it and found other people's blood to do the test, and the result was still the same, whether it was human or alien blood, it could only turn the Nine Lives Blood Cat blue, and only his blood could turn the Nine Lives Blood Cat red.

"Wait...... Additional shackles...... Wouldn't it be the lock that opened the Door of Destiny?" Han Sen suddenly remembered that when he successfully cultivated the Gate of Destiny, his body also had a feeling similar to opening the shackles, but after opening it, Han Sen didn't feel the direct benefit, so he didn't pay much attention to it.

If the test of the Nine Lives Blood Cat was correct, Han Sen thought about it, there was only one possibility.

"Speaking of which, I had already opened the lock unintentionally, so I didn't have to take that pill anymore. Han Sen's heart moved: "If I don't need to eat it myself, I can use it on other people, who should I give it to?"

Because Han Sen was still not 100% sure that there was no problem with the pill, he didn't dare to give the pill to the person closest to him to eat, but if the pill was true, wouldn't it be a big waste if he gave it to an irrelevant person.

After hesitating for a long time, Han Sen returned to the underground shelter, dug out the Dan Furnace, and then called the Little Angel, Little Yinyin, and the Empress of Thorns over respectively, wanting to see how they reacted to this pill.

Xiao Yinyin and the others sat around the table, looking at Han Sen curiously, not knowing what Han Sen wanted to do.

Han Sen put the Dan Furnace on the table, their eyes were immediately attracted by the Dan Furnace, Han Sen's gaze swept over their faces one by one, and then slowly opened the lid of the furnace, revealing the strange Pill inside.

Four pairs of eyes fell on the pill at the same time, and the Thorn Empress frowned slightly, obviously not knowing what it was.

The little angel didn't react much, just looked at the pill inside, and didn't know if she didn't know her, or if she didn't dare to move because she didn't have Han Sen's order.

Xiao Yinyin pounced directly towards the pill in the Dan furnace, but there was a figure that was faster than Xiao Yinyin.

Bao'er, who had been sitting on Han Sen's shoulder, grabbed the pill directly in a flash, and before Han Sen could stop it, Bao'er had already swallowed it in one gulp.

Han Sen didn't expect Bao'er to be so fast, it was too late to stop it, and looked at Bao'er nervously, not asking for any benefits, just hoping that nothing would happen.

However, after Bao'er ate it, her body trembled slightly, and then she didn't react else, as if it was useless at all.

Han Sen had already taken Bao'er's blood for testing before, and the result, like everyone else, would make the Nine Lives Blood Cat turn blue.

After waiting for a while, seeing that Bao'er had not changed much, he took another drop of Bao'er's blood and dripped it into the mouth of the Nine Lives Blood Cat, but a strange thing happened, Bao'er's blood turned out to be the same as Han Sen, making the Nine Lives Blood Cat pendant exude a blood-red brilliance.