Lucifaad, Underworld.
In the ancient forgotten city of Lucifaad, the original capital of the Devil race, multiple devils flew in the air, surveying the area with their magics, while one particularly powerful devil oversaw everything from above.
"Lord Zekram. We have found the source of the anomaly."
Zekram Bael, the former lord of the Bael family, the progenitor of the Bael bloodline, the unofficial leader of the Great King Faction, simply nodded as he waited for his subordinate to speak.
The devil took the cue and immediately started speaking while showing the photos that he and his team had taken.
What his ancient purple eyes saw in the photos was enough to send a jolt of shock through his body as he instantly recognized what he was seeing.
The devil subordinate, who had no idea that his master had already realized what was going on, started speaking.
"From what we found, there appears to be various prisons thousands of years old underneath the city. The purpose of these prisons and who they were used for is still unknown. But what we did find by tracing the source of the enormous holy energy was some sort of imprisoning circle that recently ran out of power."
The devil subordinate hesitated for a bit before speaking again.
"We believe that these magic circles might have been used to imprison-"
"Angels."
The sudden interruption from his master startled the devil, but soon his eyes were filled with admiration.
"Indeed. As expected of my lord. That is the same conclusion that my team has come to as well."
"...Anything else?"
"We have also found traces of Old Satan Faction activity, but those details have already been sent back to the capital for the four Satans to take care of."
"In that case, have your team retreat back to our territory. I will return once I am sure that there is nothing else left here."
"Of course."
It was only when all of his subordinates had left the area that Zekram allowed his nervousness to show as he shot towards the ground, straight towards the ruins that were once the concentration grounds for the enemy during the Great War.
Even after all these years, the Great King of the Bael still remembered the layout of this city like the back of his hand and easily navigated its underground structures, easily arriving at the familiar place that had not seen use since the end of the Great War nearly a thousand years ago.
Rows upon rows of prison cells lined with the black stones of the Underworld, allowing the devil race to use their magic circles to supress the weaker Angels of Heaven during the Great War.
Many were the atrocities committed in this place, ones that would make the current four Satans even more disgusted with their predecessors.
Countless lesser angels had been tortured, interrogated, and destroyed in these very cells. Some became fallen angels after their purity was defiled by their captors physically, mentally, and in every other way imaginable, while others who refused to break were driven to death by demonic hands.
Yet, there was one cell that no Devil dared to touch. A prison that housed the prized prisoner of the original four Satans. Specifically, the Morningstar himself.
Nobody knows who or what required such personal attention from the original four satans and why they were imprisoned in a forgotten cell that nobody was allowed to approach.
Some believed that the cell held the last remaining Demon of the Underworld. The original denizens of the Underworld that were massacred by God and his armies before Lucifer's exile.
Others believe that it was an Angel. A powerful Seraph that Lucifer somehow managed to capture and imprisoned in the Underworld for some reason.
Many were the legends and theories that spawned from this place, only to be slowly forgotten by time.
Zekram and the rest of the progenitors of the 72 pillars never really put stock into those legends. If it really was a Demon, then it was a good thing that such a savage and powerful being was held prisoner in the forgotten old capital of their race. If it were an Angel, then it was a good thing that nobody remembered this place anymore, since they did not wish to fight the heavens right now by exposing such an existence within their world.
And yet, now, after all these years, Zekram could not help the trepidation that filled his heart as he remembered the ridiculously potent holy energy he felt in the air.
Holy Energy so intense that it reminded him of the time when the Heavenly Host marched through the battlefield with the ten Seraphim leading them from the front and God himself as their general.
Soon, he arrived at the forbidden area where no one was allowed during the reign of the original four, the place that was forgotten after the two-century-long Devil Civil War and left to rot for the past eight hundred years.
And what he found there was exactly what he had seen in the pictures that his subordinates had taken.
An empty, crumbling cell with a colossal stasis magic circle etched into the floor. The remnant demonic energy was finally spent after centuries of continuous use.
And the potent remnant holy energy that no doubt belonged to an Angel.
Zekram did not know who or what exactly was being imprisoned in this place, but one thing was for certain.
Someone powerful had just woken up from a thousand-year-long imprisonment. Someone who possibly did not know about the end of the Great War, the death of God, the Devil's Civil War, and various other events that might stay his hand.
And it did not bode well for anyone to have someone like that in the wild.
'Perhaps, it is time I contact that brat Sirzechs and his friends to take care of this mess? They are the current rulers of the Devil race, so it is only right that they take care of this issue.'
With a decision made, the devil progenitor left the area, heading straight for the city of Lilith, the capital of the Underworld.
As for the being in question? He was having a rather hard time understanding just what kind of world he ended up in.
------------------------------------------------------------
Author Notes: Read 5 chapters ahead on Patreon: patreon.com/Ruijard1