The Holy Grail in its original history was the cup of clouds that Jesus Christ drank at the Last Supper and which Joseph of Arimathea used to collect Jesus' blood at His crucifixion.
As mentioned, the cup contained Bilbe's blood after his crucifixion.
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And Yuuya's Holy Grail, don't know for sure how the history of this thing was made, but Yuuya can guess after seeing the power displayed by his Holy Grail.
Ultimated Holy Grail, is a combination of three different Holy Grail Universe...Different Universe means that the history of the Holy Grail also changes.
The power to seal, if I recall with the Power of the Holy Grail that can seal the power of the Universe The God high school.
And Second, to grant a wish… this is clearly the power of the Holy Grail Universe Fate series.
And lastly, manipulating souls… I don't know for sure but according to the information I got while in this world.
The Sacred Gear Holy Grail of the Dxd world has the power to manipulate Souls and heal spirits.
So Yuuya's guess can be sure that his Ultimated Holy Grail is a combination of the Holy Grail of three different Universes.
But to seal any power with a usage limit of one month after use, this item is extremely Overpowered.
If I encounter or fight an enemy whose strength I can't face, I just have to seal that power.
So that I made it easier for me to win the battle line, but even though the power displayed was extraordinary.
Still Yuuya in his mind, he must use it wisely because if Yuuya randomly seals his enemy's power, it will backfire on Yuuya himself.
Well, right now there was a power that Yuuya couldn't face head on, and that was the power of Sirzechs Destroyer.
That's why I sealed his power, but sealing all his power would make Sirzechs suffer a lot, you know how demon society works.
They tend to follow the strong rather than the capable, even if there is a devil who is reckless, lazy and tyrannical they prefer to follow him than they choose a devil who is able to be the leader but in terms of strength he is lacking.
And also another reason, Sirzechs would be completely ostracized by his own race if I really took all his power.
Just like what happened to Sairarog, I'm not sure Sirzechs will be able to rise up like Sairarog later after I take all his power.
Therefore, I only sealed the power of the strongest technique he had…that way he was only strong but not very strong.
...
"Sirzechs" I muttered after seeing my comrade's strength soar, this technique he hasn't used in a long time.
The last time I saw him use his strongest Technique was against Beelzebub's rightful heir during the civil war.
And now he was going to use it again, with his magic power having soared tremendously over the past hundred years.
I thought that after Sirzechs unleashed this power, our enemies would be annihilated but the reality wasn't what I thought.
After I cleaned up the injured demons to quickly get a nurse, even Falbium is currently unconscious… the so-called Shield Demon Race is currently in a critical state.
I'm frustrated. I asked him to hold off the enemy so I can heal Sirzechs' wounds now it's like this. I'm watching Sirzechs' battle flow again now. Sirzechs managed to injure the enemy but after that the enemy surprised us with his Potion now he takes out a goblet from thin air, a colored cup platinum with ancient engraving on the edges.
The energy emitted by the cup felt familiar to me, I glanced at my friend Serafall who was equally surprised.
"Ajuka…That thing?, no that's impossible… even if he takes out the Grail that is somehow familiar but it's still impossible to defeat Sirzechs in his true form… any power that gets near Sirzechs will be destroyed even the small particles in the air will be crushed. just being around Sirzechs" Serafall said in a worried tone.
The woman who used to call our names ending in Tan and was usually cheerful, now spoke with a worried tone and a worried expression plastered on her face.
"I also agree with you, but what worries me so much… also I remember that the Holy Grail's Sacred Gear is currently in the human world… did he kill the previous user to retrieve the Holy Grail from its host?" I replied.
Serafall nodded and didn't ask again, so even if it was the holy grail it would still be impossible to use it to defeat Sirzechs.
And the anxiety that I was feeling earlier, made me even more worried…after a while the power was sucked together to a point.
I see natural phenomena that occur in the underworld, we even lowering our altitude so as not to be hit by a lightning strike.
This incident is very strange, because to be able to make night and day in the underworld thanks to my research.
I am the one who created the thing that can make the Underworld feel night and day.
But not with rain and storm, not even one of my creations could produce this kind of reaction.
Where did these storm clouds come from!?
All the oddities I thought about later, and I turned my head towards Sirzechs and the enemy's battle.
My eyes widened as the Grail the enemy was holding, which was empty was now filled with a shining white liquid.
And a ray of holy light descended from the sky that was once dark, now bright.
Before I recovered from my shock, Sirzechs screamed in pain. The sound of his screams could be heard throughout the demon army that had come as reinforcements.
Suddenly I was shocked by my friends, now I don't have time to be a spectator anymore...after Sirzechs returned to his form in a strange way I went straight to his place.
Together with Grayfia who looks very worried, her worry exceeds ours...it's only natural that besides being the queen of Sirzechs, she is he's wife.
Serafall also came with us, and as for the demon army they were confused by the incident and decided to remain silent.
But we were a little late, because Sirzechs received a direct hit from the enemy so that his body was thrown far uprooting a tree along its path.
"SIRZECHS!" I screamed again in despair after seeing my friend was helpless.