Because the Moonwell can provide sufficient magic energy for the Elf Clan, even without establishing towns on it, they would build towns nearby. Terres continued, "Xiling City was once one of the ten most prosperous towns on the continent, but after the Abyss Descent, the Moonwell in the city was polluted. "The three commanders once tried to find a way to purify the contamination, but they were unsuccessful and ultimately had to choose to seal the polluted Moonwell. "This is the reason for the formation of the underground seal of Xiling City, and with the sealing of the Moonwell, Xiling City gradually declined. "The surrounding forests also gradually withered, the living environment deteriorated, and finally, they had to abandon Xiling City. "And my teacher, Santos, stayed there forever to protect the last glory of Xiling City." Lu Heng had never heard of these secrets of the Elf Clan before. When Terres recounted these past events, his face was full of nostalgia and regret. He missed his teacher, and regretted not being able to see him one last time. When Terres taught the third Sword Saint’s ultimate skill, Lu Heng had already heard him mention it. His teacher, the previous generation Elf Sword Saint Santos, entered the Moonwell in the Heath Mountain Range and never returned. After that incident, the Elf King Talnas decided to abandon Xiling City and relocate the clan members to Kolos City. Regarding the abandonment of Xiling City, it is not a secret among the Elf Clan, but few know the reasons behind it. After listening, Lu Heng made a hypothesis: "Is it possible that what is sealed beneath Xiling City is an Abyss Pollution Source, and the Abyss Camp wants to unseal it and release the pollution source?" Terres nodded in agreement after pondering: "That possibility is quite high. Back when I was still in Xiling City, I heard that the contamination of the underground Moonwell was severe, severe enough to require sealing. "Moreover, after the Moonwell was sealed, there were multiple incidents of Abyss Energy overflow. "Therefore, the underground seal of Xiling City could indeed be an Abyss Pollution Source. "If this hypothesis is correct, then it is imperative to stop the Abyss Camp from unsealing it, as this is the last of the three statues that must be kept safe." Queen Orelana solemnly looked at her father’s statue and nodded in response: "I will safeguard it; no one can take the statue away." Lu Heng added, "Besides safeguarding the statue, we also need to investigate the matter of the Elf Guard’s death. Let me speak my mind. I suspect that some entity infiltrated Kolos City and used special means to kill the Elf Guard." Fiona responded: "Old Hall passed away peacefully, so at first, we didn’t think it was a murder. But there are indeed many suspicious points in this case, so I also suspect that an intruder killed Old Hall. We must find the culprit." Orelana pondered for a moment and asked, "Have you found any clues?" Lu Heng, having additional information, suspected that Old Hall was killed by the class ability of the Death God’s Deputy, so he decided to start from this angle: "I think we can investigate from the silent killing technique. There aren’t many similar techniques, and it can serve as a clue for investigation." Queen Orelana continued to ask, "What method do you think the killer used?" Lu Heng didn’t want to mention the class ability of the Death God’s Deputy just yet, as no one had proposed it so far. Thus, Lu Heng looked to Terres beside him, seeking his opinion. After a moment of thought, Terres said, "There is indeed a similar killing method; as far as I know, the Death Curse Technique can achieve this, but this curse magic has a relatively low success rate." The Death Curse Technique is a type of curse magic that, if successfully cast, can directly kill the target. However, the success rate of this curse magic is quite low; after casting, a spirit check is required, usually needing spiritual power to twice surpass the target to meet the casting conditions. Also, due to this special spirit check rule, this spell is quite specialized. When a spellcaster’s spiritual power twice surpasses the target, it means their level and combat power overwhelmingly defeat the target. In such a scenario, there are many ways to kill the target; even a casual Spiritual skill can overpower the target, rendering this curse magic unnecessary. The only use for the Death Curse Technique is perhaps to make the target appear as if they died of natural causes, without any struggle or doubt in the process. "Is there anything else?" Lu Heng continued to ask. "There is also a Fourth Transition Class called the Death God’s Deputy; I have heard of this class, which can also take the target’s life silently," Terres finally mentioned this class. Lu Heng waited for a while and then said, "That possibility is high. Currently, the Third Transition Classes have become common in the human world, and there are quite a few of them. According to the energy level development, it should be about time for Fourth Transition Classes to appear." Queen Orelana pondered for a moment and asked, "Do you have any leads?" Lu Heng mused for a while before saying, "I’ll be straightforward. I suspect another human recruiter in the city, Ke Yiming; I’ve met him a few times in the human world, and his identity is very suspicious." The Elf Clan is a civilization relatively friendly to recruiters, but it does not mean complete trust in them. The Elf Clan remains vigilant against recruiters at all times. Now that even Lu Heng suspects Ke Yiming, the high-ranking Elves present naturally become more wary. Orelana contemplated briefly and asked, "What do you plan to do?" Since Lu Heng brought up Ke Yiming, he was prepared to have the Elf Clan conduct an identification: "Directly detain him for interrogation. Check if he has the Death God’s Deputy class. "If it is confirmed that he possesses this class, the matter can be almost concluded. If not, it indicates the investigation direction is incorrect and must be reanalyzed." In the previous life, Ke Yiming was the first superpower user among humans to obtain the Fourth Transition Class, which was the Death God’s Deputy. Lu Heng didn’t know if things would be so coincidental, but he already had this suspicion, and without clarifying this doubt, he couldn’t proceed with the investigation. Orelana agreed, "Alright, let’s proceed as you suggested. Fiona, take some people to detain Ke Yiming and check his class." Fiona responded loudly, turned around, and quickly walked out of the palace area, taking a team of guards to find Ke Yiming. Ke Yiming had previously completed a task assisting the Elf Clan against the Demons and was slightly injured, resting at an inn in the commercial district. When Fiona found him, he showed a confused expression. Fiona didn’t explain the reason and took him away directly. This is the Elves’ world, and in their main city, the Elf Guard does not need to provide any reason to arrest a human. Lu Heng, Queen Orelana, and Terres waited in the study in the palace area, continuing to discuss the Xiling City underground seal and the Three Commanders Statue. About an hour and a half later, the sound of armor clashing came from outside the door, and Fiona returned quickly, bowing to report: "Your Highness, we checked, and Ke Yiming does not have the Death God’s Deputy class; the highest class he has is the Third Transition Lawbreaker, and there are no other class abilities capable of killing targets silently." 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