After Chimon had tasked Diablo with helping Youm be the new king, he wanted to go back to Veldanava's resting place to train. He wanted to test his skills and magic since he hadn't used them before. The one he can train with is his contracted Light Spirit, or Zegion once he's done evolving.
The time inside Veldanava's resting place is 5x faster than it is in the Cardinal world, so he might be there for a long time.
Teleporting inside Veldanava's resting place he first used [Raphael] to analyze the magicules.
<{Notice. Analysis of magicules is complete. There is an energy source that has a dangerous substance but can be absorbed via [Belzebuth]. The energy source is called Nihility which has the essence of the void and nothingness}>
Catching note of what [Raphael] said he says "Store everything except the magicules inside [Belzebuth]."
<{Yes}>
All the energy that had been stored inside [Belzebuth] had filled 95% of his [Stomach].
Chimon was quite shocked because the capacity that [Belzebuth] could hold was equivalent to a Universe. It was only a rough estimate though.
Looking around he noticed that there were still signs of Nihility being there.
'[Raphael], how come there are still remnants of Nihility here?'
<{Answer. The amount of Nihility here cannot be found but it is most likely infinite. As [Stomach] doesn't have the capacity to keep it all inside}>
Shaking his head he says "Come out Greater Light Spirit"
As he said those words the Light Spirit that he made a contract two years ago appeared.
"After two years you finally wish to use me? I shouldn't get mad since two years is little compared to how long we live. Our job is to only protect anyone who has summoned us." said the Greater Light Spirit as he tried to cope not being used.
For the first time in this life he felt a little bad about not using the Light Spirit's powers.
"How about this, to make it up to you, do you want to have a name?"
"A... name?" said the Greater Light Spirit as his voice slightly trembled.
"Yes, a na-"
Getting cut off the Light Spirit says "I would love a name."
"Then your name shall now be Jayvyn."
Having been granted a name, Jayvyn was now no longer a Greater Light Elemental, but now he had evolved into a Light Lord.
Since he was a Light Elemental he was already a Mid Pseudo Calamity class threat.
Though, now being a named Elemental he was now a Peak Disaster class threat.
His magicules were now at 983,825. His strength was at a high Disaster class threat while his speed and durability were at the medium class threat.
"I thank you for the name"
Getting into a stance he says "Now. Since I came here to train, let's have a go"
The Light Lord had practiced in the sword but hadn't yet done hand-to-hand combat, so this was also training for him.
Hearing his contractors words he also got into a stance.
This place was 100,000 meters by 100,000 meters so they could put more force than when they're in the Cardinal world.
Chimon suppressed his strength, speed, and durability to that of Jayvyn so that he could get a good fight. He also turned off [Uriel], but set it to that if it gets dangerous it was to protect Jayvyn from dying.
Chimon had more experience in this so he was gonna go until he was a master, or Jayvyn reached Advanced in this.
Staring at each other they both put their right foot forward. Then after that they ran towards each other as they sent punches which made tornados form.
...
Meanwhile, inside Abyss the ones Chimon named had their Soul Corridors weakened.
This caused them to panic as Souei's group was dispatched and everyone started moving until Rimuru stopped them.
He said that if he had really died then the Soul Corridor would have likey been completely destroyed.
Hearing this everyone became calmer with them still worrying about what happened to him.
The two subordinates that Rimuru would bring to Walpurgis were Hakdûr and Lake.
They both were of Low Disaster class threats.
...
It had been fifteen days inside the resting place, so that meant three days had passed in the Cardinal world.
In those fifteen days all they did was train, train, and train. Since they already know how to use their skills they were trying to find different ways to use their skills, and magic.
For Chimon he was trying different Elemental magic. He started with fire magic since he had some things he wanted to make.
The first thing he tried was to manipulate the ashes of fire. He first burnt stuff and waited which only took about five minutes. Trying to manipulate the ash he was doing it for 30 minutes until heard he obtained [Ash manipulation].
The second thing he tried was an advanced magic spell called <[Causinomancy]>. It was made by the newly acquired [Ash manipulation] along with [Electricity manipulation], [Fire manipulation], [Heat manipulation], [Hell-fire manipulation], and [Solar manipulation].
The magic was advanced because it had [Hell-fire manipulation], and [Solar manipulation]>.
He had gotten [Hell-fire manipulation] from Diablo while [Solar manipulation] was due to [Law manipulation].
It only works on living objects/beings, so if he tried to use it on people who are Spirits it wouldn't work. It would work if they had a physical body though.
He then combined [Fire manipulation], <[Explosive magic]>, and <[Fire Spirit magic]> to create <[Fire blast]>.
It wasn't really strong per say, and he just wanted to create this.
He used [Fire manipulation], and <[Holy magic]> to create [Holy fire manipulation].
This was a really powerful skill since he could, by his assumption, trap Demons and Angels. Since it had Holy attributes it was really good against undead and Demons.
The color of this varied by how much magicules he used. Normal flames are Hazard class threats. Then when he put magicules of a Disaster threat it turned blue. The last one became white when he put in magicules of a Catastrophe threat.
By [Raphael]'s analysis, when he becomes super proficient in this he could potentially summon Angel's that had died.
The reason why no one uses this, or none have this is because if they use it incorrectly they could kill themselves. It also goes through <(Natural effects nullification)> so he had to be careful.
As he saw the white flames he got an idea. He used [Law manipulation], [Light magic], and [Fire manipulation] to create [White fire manipulation].
It was just like [Holy fire manipulation], but without the Holy in it.
[Hell-fire manipulation] also works like [Holy fire manipulation] as in that it uses normal fire, blue fire, white fire, and black fire.
The same applies in that he could summon the damned souls of humans and/or Demons.
This is obviously a better version of [Black flame]'s since it can attack the spiritual body and soul.
It can also inflict pain even if somebody has <(Pain nullification)>, and it tortures the soul while also being able to destroy the astral body.
That was all for fire magic, so now he wanted to create other magic with water.
When he was thinking of ways to create different <[Water magic]> he saw something come out of his shadow.
The thing that came out of his shadow wasn't a beetle, but a humanoid figure.
When he saw that it was Zegion he was a little confused because he evolved earlier than expected.
After a couple seconds he mentally says 'The Nihility and magicules probably sped up his evolution'
'It looks like he is physically stronger than Rimuru and Diablo, so he's likely in the Peak Pseudo Catastrophe threat'
'In terms of magic knowledge I think Diablo has him beat because of how old he is'
Zegion was waiting patiently until he spoke so Chimon says "I see that your evolution has been successful"
"Yes. It is all thanks to the pure magicules you sent me"
Taking a closer look at Zegion he says "I see that your exoskeleton is close to becoming Crimson steel"
"Yes"
Now that Zegion had a human body he could teach him how to fight using it.
Getting up from a chair he made he says "We're going to have a spar so you can get used to your new body"
...
Zegion learned pretty quick as he made it to the advanced rank in hand-to-hand combat.
Now that he had someone who used their hands to fight his hand-to-hand had went to the level of a Grandmaster.
Wanting it to get more difficult he made Zegion team up with Jayvyn.
It ended with the same result as they both got destroyed. In the middle of those fights he was making spells too.
They would do this for however long they would be staying there.
Zegion and Jayvyn would also sometimes spar with each other to get better while also strategizing a plan.
If this were anybody else he would not use strategy but since it was Chimon he decided to use it.
For Zegion to use his brain and plan things beforehand then they had to be someone worthy.
Zegion was the third smartest as Diablo was second and Chimon was first.
They talked for about ten days while they were using [Thought acceleration], so it was actually only one day passed.
While they were discussing a plan Chimon wanted to use his Chaos for attacking. He didn't really use his Chaos that much since he couldn't fully control his advanced spells.
There was one spell where he could destroy the cosmos and/or the universe. He could also control the probability of something happening, but he thought that was no fun. He also has Impossibility manipulation for whenever he wants to use it.
The only time he won't use probability manipulation is when he's fighting, or bored.
So, he wanted to condense the Universal spell into a projectile to throw at people. The success wasn't that high but with his probability manipulation that he explained to no one in particular it was successful.
Without accidentally destroying the universe he could now throw small balls that could vaporize anyone.
It can't affect people who has an absolute defensive skill, or [Universal barrier].
Though the only ones that have those capabilities are of the Virtue series. Which he has two of those aforementioned skills while only one is defensive.
Done explaining it to no one he took out something and put it on the floor.
He took out a failed creation of Kurobe's creations. Even though it was a failed creation it was of the Unique grade.
With his finger pointing up a dense, black, blue, and purple ball came about. Looking at it for a split second it dissapeared and disintegrated the leggings.
Seeing that his test was a success he started making one out of his cosmic destruction.
With the one made out of cosmic destruction it could now bypass any defense it touches.
He smiled out of joy for a nanosecond then he went back to his cold face.
With his hands in his pockets he says "Hey, [Raphael]. Do you have a faster way so I can access Veldanava's, no. My older brother's memories?"
<{Answer. It is possible, but you would have to gain a lot of skills to access Veldanava's memories. The skills that were directly connected to Veldanava are scattered all over the world, so you would have to search for them manually}>
<{The closest individual near Abyss that has one of the Sins series is called Mariabell Rosso. There is also Granbell Rosso who is a relative of her. He is a bearer of one of the Virtue series}>