While the three demigods stood astounded witnessing Wyatt's surging soul energy signature despite having incubated a world-ending plague egg in his body, the devil suddenly began to laugh. Confusing the demigods who had ignited hope in their hearts, as the devil appeared to be laughing at Wyatt.
Then the devil went on to say, "Hahaha, sealing the plague egg is only temporary, it will not change the result. The plague egg will break free of the seal and it will be flared up, you and your world can only await your miserable end."
Belphegor said that the card world would be destroyed with Wyatt because he was sure that Wyatt would die in the card world and not another world. As the card apprentices had yet to perfect realm travel or invasion methods and as for Wyatt using the Devil merchant code to travel to the other world he will need consent from the will of the other worlds. Now that Wyatt's body was incubated with a world-ending plague no realms will be willing to permit Wyatt to move into their realm. That would be suicidal.
Belphegor knew this when he advised Wyatt that he should incubate the Plague Egg to postpone its hatching and then he could use this time to move to another realm and hatch it there successfully saving his card world from the plague. This was a trick he played on Wyatt, giving him the false hope of being able to save his world by incubating the plague egg in his body.
This was why he found it funny and entertaining to watch him use all of his might to seal the plague egg, trying to postpone its hatching such that he could hatch it in another realm sparing his World from certain annihilation.
Why did Belphegor relate the sudden surge in Wyatt's power levels with him trying to seal the Plague egg in his body? Because other than that he could not think of any other reason why Wyatt's soul energy signature would suddenly show such a boost despite incubating a world-ending plague egg in his body.
In Belphegor's mind, there was no way for Wyatt to rid of the plague egg he had planted in his body. Other than seeking Devil Marchant Codes help to seal it by making a considerable offering. Though the offering would be less compared to the offering required to rid the plague, it would still cost a lot to seal a plague of that power, especially in the body of a card apprentice.
As the creator of the plague egg, Belphegor was painfully aware of how tenacious the plague was and his Worldhog incarnation's current physical conditions were evidence of that. He knew even if Wyatt recruited the help of the Devil merchant code to seal the plague egg, it would break the seal in record time and wreak havoc on Wyatt and his world.
Here, in this particular part, Belgehor felt that Wyatt once again outsmarted him. As the devil merchant pact between them only specified that Wyatt should incubate the plague egg in his body, there was no specification or restriction on what he could do afterward. So Wyatt trying to seal the plague egg after incubating it was not against the pact between them.
Being outsmarted by Wyatt again, Belphegor was not enraged but rather relieved believing that this was the last straw up Wyatt's sleeve in his pointless struggle against the inevitable. In a way, he fooled himself into believing what he wanted to believe. Mostly because Belphegor did not want to face the reality that sacrificing his Worldhog incarnation and a realm fragment was pointless. So much so that just thinking in that direction scared him.
While the hearts of the demigods and the devil were turbulent with waves of emotions, Wyatt discovered that Belphegor's plague egg helped him satisfy not one but two conditions to unlock the fourth transformation of his calamity soul gem. The plague egg not only satisfied the Evolutionary ingredient condition but also satisfied one of the unknown conditions that Wyatt had to explore by himself.
The unknown condition required to unlock the fourth transformation of his calamity soul gem turned out to be a realm fragment, surprising Wyatt. If not for Belphegor, it would have taken Wyatt a while to uncover this.
[Please, satisfy the remaining two conditions to unlock the fourth transformation of your calamity soul gem to start its evolutionary process as soon as possible.]
Reading this notification Wyatt shook his head in dismay wondering how long it would take him to uncover the other two conditions to unlock the fourth transformation of his calamity soul gem and start its evolutionary process.
Considering that one of the unknown conditions turned out to be a realm fragment that the demigods of this world had only had the opportunity to hear about in the historical texts, Wyatt felt that the other two unknown conditions were not normal either and maybe it was impossible to for him to uncover them on his world he would even have to search the vast Myriad realm to it.
But Wyatt's history of unlocking the previous transformation of his calamity soul gem told him that one of the remaining two unknown conditions or both of them could be a rule or rule meaning. Similar to how the blood curse meaning the blood rule was one of the requirements to unlock the third transformation of his calamity soul gem. There could be other meanings of other rules that could be one or both of the unknown conditions to unlocking the fourth transformation of his calamity soul gem. There was no telling if one or both of the unknown conditions were some rule meanings but it was worth giving it a try before searching the myriad realms.
As Wyatt's soul energy signature stabilized and returned to its previous state, the Devil's laughter came to an abrupt halt as it glanced at Wyatt along with the demigods. To their astonishment, Wyatt looked fine as he asked the devil, "You still here? Let me help you."
Wyatt's hand swiftly pierced three different points on the Worldhog's body, destroying its three hearts and the core they were hiding instantaneously. In his current drained condition, Belphegor could not even put up a struggle and could only die without getting a satisfactory explanation as to what just happened. Did Wyatt seal the plague egg after incubating it in his body? How long did Wyatt though he could keep the plague egg sealed?
After swiftly killing Belphegor, Wyatt immediately stored the devil rank Worldhog's body in one of his storage card. And neither of the demigods stopped him from doing so as Wyatt had faced it solo and defeated it solo at a costly price. So the spoils of the war belonged to him and him alone.
The demigods stared at Wyatt waiting for him to explain the situation, however, Wyatt stood there quietly with no sigh of sharing the details with them. Impatient Colleen unable to hold back her worries asked in concern, "Wyatt, did you really seal the plague egg in your body as the devil said?"
"Yes, I did but it is only a temporary measure—" As Wyatt said this he rapidly coughed blood and his soul energy signature sharply decreased from that of a demigod to a card master. His healthy bulky body shrank at a visible rate, so his well-defined muscles were gone and his skin was sticking to his body. Right now he looked like he had starved for months.
Seeing this the demigods panicked, especially Colleen as he called out Wyatt's name repeatedly in distress, "Wyatt! Wyatt! What's happening?"
Then summoning a neon-red elixir from her grimoire, opening its cap she fed it to Wyatt explaining, "Drink this, it's an elixir."
Holding Wyatt in her embrace, Colleen slowly poured the elixir into Wyatt's mouth. As soon as the elixir touched Wyatt's lips it would vanish into his body and help with his recovery. Soon Wyatt's complexion turned for the better but his body was still thin and fragile.
"This must be the side effect of whatever means he used to gain the power of a demigod," Henricks said, looking at Wyatt's condition.
"This may sound harsh, but with his current condition, I don't know if the seal on his body will be able to lock the plague egg for long. So, I think to ensure his sacrifice was not in vain. We should immediately move him to another world. If Wyatt was in any condition to speak he would also agree with my words," Plague Doctor Joy reminded Colleen and Henricks.
"..." Listening to Joy both Henricks remained quiet and did not pressure Colleen into letting him take Wyatt to another world as he found it difficult to address this. He felt that it would be best if Colleen was understanding and handed Wyatt to him out of her own accord.