It was something special that summoned itself.
The reason for bringing Gudako along was entirely because a justice-seeking partner who was being prepared to act as a catalyst was in this world. That's right, the one summoning Yumeanto was the FGO parallel world. Here, a famous Holy Grail War in the world of magic was taking place.
This Holy Grail War was the Fourth Holy Grail War.
As for the summoner, it wasn't those Masters. It was the participant of this Holy Grail War, Caster Gilles de Rais!
That's right, the one just seen in the previous singularity, Gilles de Rais. Also known as Marshal C!
Aside from being a French military commander who won countless battles, he was also a famous black magician in European history. He was also one of the real-life prototypes for the villain "Bluebeard" in Western fairy tales.
He went astray due to Jeanne's death, and was unexpectedly summoned in this Fourth Holy Grail War. His class is Caster. He is not suitable for the "Caster" class at all. It can only be said that it was an "accident" that the summoning ritual that Yuuki Ryuunosuke performed could be considered a successful summoning ritual.
And now, this accident in the Holy Grail War has summoned an unspeakable thing after releasing its Noble Phantasm.
The Roruenjo Kyohon, a grimoire bound in human skin. It can summon and command monsters from the deep sea. This book possesses the ability to act as a magic core, allowing it to independently launch Grand Magic level rituals, ignoring the caster's own magic.
It records forbidden knowledge about the ancient gods before the existence of mankind. The version Gilles de Rais possesses is an Italian translation by the magician Francois Prelati, the original being in Chinese from the Xia Dynasty. It is said that the earlier original was written in a language other than human language.
As for the specific author, it is unknown. It is estimated to have been written around 3000 BC. Other than the fact that the original manuscript was written in a pre-human language, everything else is unknown. There were also previously theories that the original was written on clay tablets.
In the Cthulhu Mythos, it is a grimoire that can be ranked alongside the Necronomicon, written in R'lyehian, and used by ancient priests and magicians.
And this R'lyehian is actually the place where the Great Old One, Cthulhu, sleeps.
That is to say, this Noble Phantasm is actually related to Cthulhu.
"What is that?"
After Yumeanto Yehuang and Gudako arrived in this world, they saw the huge creature on the river surface, and Gudako let out a gasp.
It was a sea demon with several tentacles. But it was still far from Cthulhu.
Cthulhu's image roughly combines features of an octopus, bat, and human. It is entirely green and extremely large, said to be as high as a mountain; its soft head has countless tentacles, with three eyes on each side, its body is fat and covered in scales, its limbs have huge claws, and its back has a pair of ragged, undeveloped wings.
This sea demon may simply be a creature associated with Cthulhu. Or, the connection isn't that great. After all, Cthulhu's minions have been recorded, called the Stellar Kin. They look like giant cosmic octopuses, very similar to Cthulhu.
So, the sea demon might just be a creature formed by Cthulhu's corruption.
But even so, it would take several Servants working together to deal with it.
"This is a sea demon, it must have been summoned by a Servant!"
Yumeanto Yehuang explained to Gudako.
"Servant? Are there Servants here too? Is this a Singularity?" Gudako immediately exclaimed in surprise.
Yumeanto Yehuang shook his head: "No, this is not a Singularity, it's a parallel world!"
"???"
Gudako was dumbfounded. Suddenly, she's in a parallel world?
"Do you remember how Chaldea's former-former director founded Chaldea?"
"I heard from Olga Marie, the director, that it was after participating in a Holy Grail War and getting the inspiration and funding that he founded Chaldea!"
Gudako knew about this.
"Right, and here, a Holy Grail War is happening!"
Yumeanto Yehuang's words undoubtedly shocked Gudako.
"Holy... Holy Grail War??? What are we supposed to do?"
"Of course, we'll join the fight for the Holy Grail!"
Yumeanto Yehuang looked at the sea demon on the river surface. It was the one that responded first and arrived. He thought it was another Great Old One or Outer God that responded to the summon, but it turned out to be such a weakling. But the summoning itself didn't seem to be legitimate.
It's just a Roruenjo Kyohon that summons Cthulhu creatures, not even the original, it's just a copy.
If Yumeanto Yehuang wasn't in this dimension, he wouldn't be able to sense it. So, after Yumeanto Yehuang came over, there shouldn't be any other Outer Gods or Great Old Ones coming over.
It's just a fake classic, Yumeanto Yehuang is in the same dimension, so he can sense it, as for the others, don't think about it.
...
"Other Servants are coming!"
Gudako was also watching the river surface, she's already a proper Master, so of course she recognizes the Servants as they appear.
On the scene right now, it's a familiar face. Artoria, King of Conquerors Iskandar, and Diarmud, three Servants have assembled, apparently also discussing how to deal with this big guy.
"Hey? That Servant looks familiar!"
Gudako looked at Artoria who was discussing by the river, and found that she was very similar to a Servant in her Chaldea.
"It's... King Arthur. But... why does she feel completely different?"
Gudako finally remembered that face.
"That's normal, because that's the true appearance of that King Arthur, the one in Chaldea is a reversed version of King Arthur. After all, there's no concept of time in the Throne of Heroes, you can summon a young King Arthur, and it's also normal to summon a reversed personality." Yumeanto Yehuang's explanation finally made Gudako understand.
To this, Gudako could only feel extremely astonished.
"Then the other two Servants are Deadwater?"
"Although I know their true names, you will definitely meet them personally later, so let you ask them yourself!" Yumeanto Yehuang just smiled and didn't say it.
Gudako pouted: "Fine!"
Please, dear reader, for some free flowers and rating votes.