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After Tragedy Writer frankly stated that he did not support Philip instead of Kafni, He added new information.
“Besides, I don’t support Philip much. It’s all his ingenuity. His use of the deity’s strength is more of a use of the name to fool those who follow him.”
“Even Cup-holding Lady only gave him [Rustless Blood]. The ‘sugar’ he made has nothing to do with Cup-holding Lady’s divine art or even the alteration spell. It’s just a pure ritual product.”
“Rustless Blood?” Annan was a little surprised, “Philip is a Blood Eater?”
Blood Eater was Berserker’s Silver Rank profession’s advancement. After drinking Rustless Blood and advancing, they only needed to sacrifice a cup of their blood every month to get Rustless Blood which extended their lifespan.
After taking it, they would be filled with vitality for a month. Their bodies would display potent rejuvenation. They would no longer get sick, and their appearance would not grow old. However, if they couldn’t take Rustless Blood in time, their blood would “rust”, resulting in a torturous death.
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This was indeed in line with Annan’s impression of Philip.
However

“As far as I know, Prince Philip is not a transcender.”
“He’s not.” Tragedy Writer replied with a smile, “He is a born ‘Rustblood’. Therefore, he cannot become a Berserker, let alone worship the Cup-holding Lady like an ordinary believer.”
“His homemade candy laced with Demon Blood is a superficial faith in the Cup-holding Lady. Instead, he holds a deeper belief in the Rotten Man. His belief in me is an act to control his men. He will hold a ritual to the Cup-holding Lady and the Rotten Man daily to maintain his youth, but that’s just an ordinary ‘ritual’, not a ‘sacrificial ritual’ on a religious level.”
“He is using this method to create momentum for himself. However, he knows it, the Cup-holding Lady, the Rotten Man, and I know it too. Prince Philip doesn’t believe in any deity.”
“He only believes in himself. He is a simple child because he only wants to have fun.”
“It’s a pity. His origin, fate, talent, and illness prevent him from making this wish come true.”
—Rustblood.
Annan learned a new term.
This was the term used by the people of this world to refer to hemophilia.
Their skin often had bruises for no reason or bruises that were difficult to dissipate, even when it was due to a soft impact. Their joints were abnormally stinging and stiff, and their urine occasionally turned rust-colored
 People believed their blood had “rusted” when injured and bled profusely.
People in this world had already discovered through Father Flint’s divine art and the judgment effect of the Alteration Spell that human blood contained a small amount of “iron”.
However, they didn’t know what form the iron existed in
 Some wizards interpreted this phenomenon as “mineral veins are solid, so the iron is solid; blood is liquid, so the iron in blood should also be liquid, but it’s mixed in blood.”
Those wizards were ancient doctors and researchers.
They believed that blood could rust like iron and become “unhealthy”, thinking that people got sick because “blood would rust”.
That was why the blood in the cup that the Cup-holding Lady bestowed, which could eliminate all kinds of diseases and eternal youth, was called “Rustless Blood”.
Since a Rustblood would bleed profusely once a small cut was made, they could not carry out a ritual dedicated to the Cup-holding Lady.
After all, not all Cup-holding Lady rituals would give back “Rustless Blood”. Only Blood Eater could get Rustless Blood easily and quickly.
Hence, the Cup-holding Lady simply forbade the Rustblood to perform a self-sacrificing ritual dedicated to her. This meant that Philip could not sacrifice his blood to the Cup-holding Lady.
And the curse of berserker must be the type of self-harm. This is the prerequisite for advanced berserker.
“That is to say, if Philip is a Rustblood, he shouldn’t be able to sacrifice to the Cup-holding Lady. He can’t be a berserker, either. So—”
The answer was self-evident.
What Philip drank was not “Rustless Blood” bought with his blood.
There was more than one Blood Eater, nourishing him with his blood!
The time limit for Blood Eater to change blood was nine days before and after one month.
The ritual could be held nine days in advance at the earliest. If it were earlier, the “Rustless Blood” in their blood would not be exhausted. The [cup] would not treat it as the user’s blood.
If it were nine days late, the blood would decay.
The weight of “a cup of blood” referred to one-ninth of the total blood in the human body. That was about 500cc.
Generally speaking, the blood sacrificed to the Cup-holding Lady would remain in the disappearing state for nine months and then return in the form of Rustless Blood
 The typical Cup-holding Lady believers would sacrifice a cup of animal blood every nine days. Then, they would add one or two drops of their blood. After nine months of worshipping, they could exchange for a continuous youthful state.
However, Philip couldn’t use this method because of his Rust Blood disease.
However, neither divine art nor self-healing could relieve the sacrificer’s weak state. It was impossible to regenerate blood either.
Strictly speaking, the blood was not lost but existed in their bodies differently.
Without self-regeneration, continuous blood loss of 1,000 milliliters during the Rustless Blood expiration period might already be life-threatening.
A Silver Rank Transcender couldn’t dedicate his life to Prince Philip directly and cheaply.
However, they still had a way to sell Rustless Blood to Philip as long as they had enough people.
During each sacrifice, one could obtain a small portion of Rustless Blood, which could be sold or given to Philip. If the vendor sold one-twentieth of their Ruthless Blood, their maximum lifespan is reduced by one day. Every cup of Rustless Blood could extend the lifespan of a Blood Eater up to 39 days. If consumed in smaller quantities, the effective duration would be proportionally reduced. However, the invalid duration remained constant at nine days before it became ineffective.
Rustless Blood had 21 to 22 days of potency, nine days of ineffectiveness, and nine days of sickness per month. By adjusting the flexible time of these eighteen days, they could distribute the blood.
“Why does Philip want Rustless Blood so much?”
Annan asked with some vigilance, “Are you going to say that this question requires 40 holy light engravings?”
“This is a supplement detail to the previous question, and I will not charge for it.”
“Thank you so much.”
“You’re welcome.”
Tragedy Writer smiled slightly, “The reason is simple. Philip was old once.”
“He had been old once?” Annan could hardly comprehend this.
“That’s right. He has indeed [aged] once and was so old that he was close to death.”
Tragedy Writer said affirmatively, “That is the power of [legendary] curse vessel.”