Tiffany and Adrian watched Bob in awe and exhilaration. They were worried as Bob had stood in silence for more than half an hour. Winnie screamed as she exclaimed, "Dad! This is amazing!"

  "Well done!" Nathan clapped in excitement. "I knew you could do it!"

  "Why didn't you do this earlier? It could have saved us so much time doing surgery." Bob asked Nathan, as he receded his transformation.

  "First, you were unconscious, and I could not obtain consent. Second, going through with the surgery first will help mitigate the side effects of this procedure."

  "What are the side effects?" Bob asked.

  "Whiteboard." Nathan chanted, and a whiteboard appeared out of thin air. Then, he said to the family, "Please take a seat in front of me."

  Bob cast a spell that replaced the stone bed with a stone couch. "It feels so easy. I feel so strong, even in my human form," Bob continued to marvel at his newfound strength.

  "Yes, you just experienced a process called Level Up." Nathan said, smiling in satisfaction of Bob's condition. "Now, Bob and Tiffany, would you like a long explanation or a short one, Bob and Tiffany?"

  "Long." "Short." Tiffany and Bob said simultaneously, then exchanged glances.

  "Long" Bob corrected himself, yielding to his wife.

  Nathan cleared his throat and began his explanation.

  Glyphs did not only provide instructions for a spell. They also recorded the body blueprints of all living things. The glyphs of skills and spells could be imprinted onto a person's body after repeated usage, allowing them to be passed down to the person's descendants, who naturally share a part of their parents' glyphs.

  Bob’s family nodded in agreement as they knew about the inherited skills.

  Since a glyph could be used to represent a person's body, injuries could be reflected on the glyph as damages as well. If a glyph is damaged to the point where a significant chunk of it is missing, the person would be weakened or crippled. Unlike the glyphs for spells or skills, those that represented the intricacies of a human body were far too complex for mortal hands to craft. Therefore, no skillful surgeon could repair missing glyphs.

  The Resurrection spell was a world-renowned Godly Skill that bordered on a Miracle. Through inferring missing parts of its patient's glyph, the creation of artificial living tissues and generation of bodily fluids, it was a spell that could cure any injury, seemingly without repercussions, even shortly after the patient was medically declared deceased.

  "Any questions so far?" Nathan paused his lecture.

  "Right, however, you did not heal me using Resurrection, didn't you?" Bob pointed out.

  "You're right. Unfortunately, I cannot cast Resurrection, and the children do not have enough Mana for it. So, I used a demonic ritual called Level Up, which I learned from an ancient demonic textbook." Nathan continued his lecture.

  Level Up, unlike Resurrection, was a Mythical Blessing passed down in the religion of a God from a millennium ago. The main purpose of the Blessing was to allow its users to gain strength quickly and safely without repercussions from their injuries. The Blessing contained multiple predefined glyphs from various living creatures, including humans, for several combat disciplines, which it called classes. It worked by stockpiling Mana from the user's victims with an enhanced Mana Absorption process. Whenever the quantity of the stockpiled Mana reached a threshold, it would overwrite part of the user's existing glyph to enhance their strength, and healing them in the process. Lastly, note that it could also create artificial living tissues, like Resurrection.

  During Nathan's earlier operation, he employed Behemoth's and Leviathan's glyphs as the predefined blueprints for the Level Up spell, before implanting the Demonic Blessing into Bob and his children.

  "By overwriting, do you mean..." Tiffany questioned with a furrowed brow and a worried tone, leaning forward. Nathan felt glad that Tiffany was able to understand the gravity of the situation.

  "Yes, it can turn you into something different. For example, let's say someone's fighting style is centered around strength. They could become more powerful as a Spellcaster if they chose the blueprint known as the Mage Class."

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  "Do you mean someone who does push-ups everyday could have gained leg strength instead?" Winnie found this strange.

  Nathan nodded, a wry smile on his face, "Yes, precisely. It's...an interesting phenomenon, to say the least."

  "Who on Earth would like that?" Bob furrowed his eyebrows.

  Nathan smiled and tilted his head, conveying a sense of helplessness as he did not know either. Then, he continued.

  Goddess Liliana's Blessing was in direct contradiction with the Level Up Blessing, rendering the family unable to activate the later. For example, while the Level Up had an improved Mana Absorption process that allowed its users to quickly stockpile Mana, the Goddess's Blessing completely blocks any unrecognized foreign Mana from entering its users' body. To gain strength, Level Up users needed to continuously engage in combat. However, Goddess Liliana's believers would have to pray in the church, where Divine Power generators would convert foreign Mana into Divine Power to allow absorption by its believers. Of course, the Goddess' believers could still absorb unclaimed natural Mana in the wilderness.

  Even though Nathan did not believe in the Goddess, he agreed with the workings of her Blessing as Mana Absorption was a risky process. Mana could store and contain information, such as lingering emotions, memories from their previous owners or about the spell being cast. Humans strongly synchronize with each other through emotions lingering in Mana. During the process of inflicting injuries or taking lives, some people might felt as though they had dominated another human being, instilling them with a sense of superiority and accomplishment. For instance, there used to be a demon cult that devised a technique to efficiently absorb Mana from their victims. This method proved to be extremely addictive, leading to the emergence of numerous serial killers within the cult, causing its destruction from the inside. Therefore, by converting Mana into Divine Powers, the generators located in the Churches removed these lingering emotions from Mana, rendering them safe for absorption.

  To activate Level Up, Bob, Adrian and Winnie needed to stockpile a huge amount of Mana. However, simply removing Goddess Liliana's Blessing was not enough, because natural Mana absorption only had an efficiency of about five to ten percent. Therefore, to completely utilize all Mana left behind by the godly beasts, Nathan employed the Blessing from the now-destroyed demon cult, which passive skill was called Advanced Mana Absorption. This skill allowed the three to absorb most of the Mana in their vicinity. In consideration of the risks involved though, Nathan had already removed the skill from them after the operation.

  Nathan then raised a question to the family, "If the Level Up Blessing can heal all of your injuries, isn’t it too good to be true? Why don't we give everybody the ability to level up?"

  Tiffany replied, "Right, why not?"

  "Is this related to the side effects you mentioned earlier?" Bob asked.

  "Right," Nathan continued.

  Resurrection and Level Up could achieve miraculous results in saving a person from the brink of death. Nevertheless, they were not without risk. For example, a Level Up user, who had repeatedly suffered life-threatening injuries to be healed by the blessing, could have most of their body constructed by artificial living tissues. The wounded who were cured by Resurrection could also have their vitals being assembled by these emulated cells. The Mana in the emulated tissues maintained their function as cells due to the intricate instructions encoded by the healing spells. However, just as the Resurrection and Level Up spells could instruct Mana to operate as cells, other spells could countermand the same Mana to relinquish their functions in a person's vital organs. Since the Level Up blessing exists, Nathan hypothesized that someone could have created a spell to dispel artificial living tissues, akin to Disintegration or Death spells.

  "In short," Nathan paused and took a deep breath before continuing. "If there is a spell that can convert artificial tissues back into Mana, then anyone who overuses the Level Up ritual would be at risk of getting disintegrated."

  The family suddenly realized the gravity of the situation and stared at Nathan with wide eyes.

  "Do you know if the Disintegration or Death spells actually exist?" Tiffany asked with curiosity.

  "At the very least, I don't know about them. However, the reason could be because there aren't many Level Up users in the Kingdom, where they are seen as demons. Outside of the Kingdom, they could exist. Moreover, I can create those spells if necessary." Nathan answered as a matter of fact, without bragging.

  "Do spells like the Death spell work on us?" Bob asked.

  "No, they would be harmless to people without Mana created artificial tissues. But, they can open your wounds, Bob." Nathan answered, warning Bob seriously.

  Bob gently touched the scar on his left chest with his right hand, trying to discern any difference between real and artificial tissues. "I can't tell the difference," he thought to himself.

  Adrian then asked. "I don’t feel Mana in our vicinity anymore, where did they go?"

  "Bob absorbed all of the Behemoth's Mana. I passed Leviathan's Mana on to the three of you. Once you had amassed sufficient Mana for leveling up, I absorbed the rest." Nathan answered.

  The family raised their heads and looked at Nathan for a brief moment.

  "Are you a serial killer, Nathan?" Winnie asked, her eyes narrowed with concern.

  "No, I am not." Nathan said firmly, but Adrian and Winnie seemed skeptical. So he elaborated. "Not everyone enjoy dominating other human beings. For me, it pains me to know when someone is sad, scared, or in pain..."

  "So, I never want to hurt anyone," Nathan tried to explain.

  "Does absorbing all that Mana make you feel sad?" Winnie asked, her voice filled with concern.

  "I almost broke out in tears because Levi was so sad," Nathan lowered his head, his voice tinged with sadness. "It makes me want to help her."

  Winnie walked to Nathan and patted him on his head. "Don't be sad, you saved us. We are all very happy to have you here."

  "Thank you Winnie." Nathan smiled, with a part of him feeling glad that Winnie no longer scorned him.