Several years after the return of the Father of All Devils, Baator, Ninth Layer of the Baator Nessus, Holy Imperial Capital of Anor Londo, Personal Residence of Imperial Elder Vali Lucifer.
After the establishment of the position of the Chief of Staff of the Imperial Army, which oversaw all military branches of the Chthonian Empire of the Baator, Arthur Pendragon.
He was acting as Lord Marshall Militant, was promoted to the position of the Chief of Staff, Vali was forced to take the mantle of the Lord Marshall Militant.
The position of the Lord Marshall Militant was boring because it was an administrative position where one had only one greatest enemy... the paperwork and administrative duties.
And, of course, to a battle maniac like Vali, this was a torturous experience.
As he was finished with another wave of the paperwork, suddenly he felt the Contract Flyer that was in his drawer as he had almost forgotten about the existence of this Contract Flyer because he wasn't ever using them at all.
The Contract Flyers were magical communication quasi-talismans that were distributed by the Devils through worlds, plans and even thrown out into the Endless Void as they found their way to countless dimensions.
When a person found them and activated them, they could summon a devil to make a deal with them.
Lord Marshall Militant Vali Lucifer didn't make use of these because he found it useless to bargain with beings that were weaker than him; he would rather kill them and take their souls for his use by force.
Vali took the Contract Flyers and injected a bit of his Demonic Energy into the piece of paper as he realized where the initiation for the call was coming from, as he grinned a bit at that.
"Sealed World? How the heck did it get past the world barrier and one in the Endless Void at that, on the top of everything, the alternative version of Earth."
He muttered because this was the most unusual situation.
The Endless Void, from what they understood, which was actually very, very little, was an absolute mess of countless Universe, sometimes even parallel worlds appearing somewhere in it due to some circumstances.
"Maybe I should go and take a look... If I am lucky, then even time will flow there differently and on top of that, at least I could get away from this dammed paperwork."
After considering all alternatives that were available to him, in the end, Vali decided to slip away and go on a trip.
He knew that if he found a parallel world to Earth and one where time flew differently, he could get some nice reward from his father because the parallel worlds and these things, which were unnatural phenomena across the Endless Void, were one of his objects of study.
As any proper devil, he was already scheming that he would go and take a look at the World he discovered, then gather as much data and world coordinates and after returning back to the Empire, he would directly get to his father and exchange them for demotion back to Commander of Khaos Brigade.
"Yes, that should work."
For Vali, this was a perfect plan because he knew that his father would agree to it if he presented him with something of significant value, and if nothing else, then at least he would obtain the souls of the entire population of the planet.
Though, he doubted that would be the case because the experience taught them that each Sealed World was a peerless treasure that was hiding something, so he couldn't wait to uncover what the one where he was heading was hiding.
He would finally return back to the field and battle, getting rid of the paperwork and other extremely annoying administrative duties that he absolutely abhorred doing at all.
After he decided on that, he now needed to sneak out of the Imperial Palace before someone from his wives, mainly Rias or Latia noticed that he was missing as they would haunt him about that.
Even worse, if either one of his aunts, Grayfia or Hela, noticed that he was missing from his duty, he shuddered at that thought.
While he was heading towards the Sealed World somewhere in the Endless Void, getting there was actually way easier than it seemed, mainly because of the Contract Flayer that was essentially establishing the connection between two points in the Void.
Due to that, he needed only to go to Void Gate and voa la... he was at his destination.
It didn't take a long for him to arrive at the Dimensional Gateway, where he established the Dimensional Connection between the Baator and the Sealed World somewhere in the Endless Void through the single that the Contract Flyer was constantly releasing.
'Hmm... The World Barrier is strong... very strong...'
Vali muttered because when he wanted to enter the World, he noticed that the World Barrier was very powerful, far more than it should be, probably enough to hold even an average Tier 12 expert at bay, which meant that this was probably artificial.
If it was so, then it meant that the World was hiding some very valuable secrets and treasures.
And even if it wasn't the case, and it was natural, even that was good, because that meant that the World had some extremely precious things in it, because the Word Barriers that strong were enveloping only worlds that had extremely dense energy like Mana or Heaven and Earth Energy and so...
Meaning it would be full of natural treasures, ores, herbs, resources and other things, which would be a great boon for the Empire once again.
"Who would have thought that from me throwing the Flyers randomly to the Endless Void out of boredom would bring me something like this."
Vali muttered under his breath as he was calling the Power of the Father of All Devils, so he could borrow the power of his father to break through the World Barrier and enter the Sealed World.
Soon enough, he only heard a small crack as he entered the Dimensional Pathway surrounded by the full power of the Father of All Devils, who sent him his blessing, as he grinned because that meant that his father was approving of what he was doing right now.