Isekai Adventure in the Dimensional Cube

———「Immortal Spirit」.

This is a race with potential far above the rest of the lower world's species, possessing multiple attributes and appearances, but their numbers are extremely rare.

They are seen by the people of the lower world alongside elves as the most representative magic species, born with the ability to use magic and even capable of creating miracles, thus being regarded as the race closest to the gods and considered as the most beloved children of the gods.

The gods regard them as their avatars, and most people in the lower world also consider them mysterious and noble. They have appeared many times in various hero stories and have helped heroic figures recorded in history in ancient times before the gods descended, granting them aid and power, enabling the human race to fight against the monsters that emerged on the surface without divine blessings, eventually successfully sealing the underground city and building the Tower of Babel at its entrance.

It can be said that they are the proxy version of divine blessings before the gods came to the surface. Sometimes, they provided humans with magic, sometimes with powerful weapons. Some Immortal Spirits even turned their bodies into weapons or steeds to accompany the ancient heroes, fighting alongside humans against the calamities caused by monsters.

If not for the active participation of the Immortal Spirits, the ancient heroes would definitely not have been able to defeat the monsters, only becoming their prey, living in constant peril.

Thanks to this, the status of the Immortal Spirits in the lower world can be said to be second only to that of the gods, and in some places, they even receive a more devout belief and reverence than the gods, deeply loved and respected by ordinary folk.

Previously, the rental bank Reiger visited was built by gnomes, a relatively common and numerous type of Immortal Spirit that has integrated into human life, unlike other Immortal Spirits, who mostly live in secluded secret realms.

Overall, the Immortal Spirits remain a particularly noble, especially dignified, and mysterious race akin to gods, undoubtedly capable of being compared with ancient, heroic warriors in people's minds.

However, there are exceptions to everything.

As the lower world's race most adept at inciting miracles, Immortal Spirits have multiple attributes and appearances.

Gnomes typically appear as small elderly figures, skilled at using earth-based magic, possessing dexterous hands capable of crafting various precious gems and rare metals.

Besides gnomes, there are also Fire Spirits, Wind Spirits, Water Spirits, Thunder Spirits, Light Spirits, and various other types of Immortal Spirits, each possessing their attributes and dominant elemental powers.

Yet precisely because of this, they are easily influenced by external factors, consequently reversing their form, attributes, appearance, and spirit.

The so-called Polluted Immortal Spirit is exactly such an existence.

"Perhaps it was in a distant ancient time."

"Back then, the gods had yet to descend, but as the avatars of gods, possessing the nature of listening to divine voices, the Immortal Spirits followed the will of the gods, journeying through the lower world, selecting heroes, granting them their power, enabling humans to fight against monsters."

"This war between humans and monsters, the fiercest battleground, was undoubtedly here — the underground city."

"Even though Orario had not yet been established at that time, to fight against monsters and prevent them from surging onto the surface, the Immortal Spirits inevitably rushed here with their chosen heroes, even venturing deep into the area."

"And in any war, there are bound to be sacrifices."

Reiger's voice resonated both calmly and indifferently, echoing in the grotto filled with brightly colored monsters.

"Immortal Spirits can die, be killed, and even be devoured by monsters, becoming victims of war."

"It was under such circumstances that the 'she' you mentioned was born."

"An Immortal Spirit who ventured into the underground city in ancient times yet was devoured by the monsters there, merging into one with them, leading to a complete reversal in existence's state and attributes."

"Thus, a Polluted Immortal Spirit governed by primal desires such as being devoured, seized, or immersed, came into existence."

"She" has survived in the underground city for over a thousand years.

"She" fell into a frenzy, transforming into a witch immersed in power and destructive cravings, treating the underground city's monsters as prey, crazily devouring magic stones to enhance her power.

"She," like the other monsters, longed to rush to the surface, hungered for destruction, craved to trample life and earth.

Thus, "she" used the power of the Immortal Spirit to create multicolored magic stones, used them to manufacture multicolored monsters as her appendages, and even created hybrid beings of humans and monsters, creating strange entities to ascend the surface, destroy the Babel Tower and Orario, and liberate the sealed entrance of the underground city, to once again see the light of day.

"You and that red-haired female monster were created by 'her' using multicolored magic stones."

Reiger took out a magic stone.

It was a magic stone completely different from those the monsters possessed.

Monster magic stones varied in size and shape but were uniformly bluish-purple in color.

However, the magic stone in Reiger's hand had a multicolored core, with only the outer shell being bluish-purple.

This is the multicolored magic stone, something Reiger acquired during the Monster Festival.

He defeated the man-eater rampaging on the surface at that time and collected the magic stone it dropped.

And this magic stone is the creation of the Polluted Immortal Spirit and also the source of power for the strange beings.

"You were originally humans, just like that Polluted Immortal Spirit. You lost your lives in the underground city, encountered that Polluted Immortal Spirit, and had those multicolored magic stones implanted within you."

"Accordingly, you were reborn, becoming hybrid creatures of humans and monsters, possessing human consciousness and wisdom, but your bodies transformed into monster forms, gaining monster powers."

"The reason why you can command these multicolored monsters is because, strictly speaking, you are products of the Polluted Immortal Spirit, acting under her intentions to destroy the Babel Tower and Orario."

Reiger forcefully crushed the multicolored magic stone in his hand, maintaining a calm expression.

"The 'Treasure Bead Fetuses' you cultivated in the food storage of the 24th and 30th floors are embryos born from the Polluted Immortal Spirit's power, essentially her fragments."

"As long as there is enough nutrition and enough magic power, those offshoots will break out of their shells, parasitize on the bodies of monsters, and transform into female-type monsters."

"If the nutrition is sufficient and the magic power is sufficient, they might even transform, evolve, and completely become beings equivalent to the incarnations of the Immortal Spirit."

"By then, their strength will be powerful enough to destroy all of Orario."

This is why the monsters established nurseries.

It is not just to produce colorful monsters as combat power, but also to cultivate the incarnations of the Polluted Immortal Spirit.

"Of course, you are not alone."

"There is a Mad God in Orario named Eriniou."

"In Heaven, Eriniou means City Destroyer."

"He also wants to destroy Orario, destroy the Babel Tower, and create chaos and madness upon the ground."

"Therefore, He approached you, also sought out the remnants of the dark faction, combined three powers to form an alliance, and acted together to destroy Orario."

"So, the remnants of the dark faction appeared on the 24th floor and helped you block us, because you are all in cahoots."

"Including Eriniou and His devotees, they were there at that time, right?"

Reiger looked at the white-robed man frozen there and said with a faint smile.

"But He should be quite troubled because the Polluted Immortal Spirit standing behind you monsters is not just obedient."

"She also has her own desires, desires beyond just destroying Orario."

"Namely, she wants to devour her kindred and gain more power."

What the Polluted Immortal Spirit most wants to devour isn't monsters or their magic stones, but kindred Immortal Spirits.

Being an Immortal Spirit herself, "she" has an intense craving for the flesh and blood of her former kin, under the pretense of wanting to merge with them."

"Eriniou and the dark faction, needing the power of the Polluted Immortal Spirit, could only cater to "her" demands, seeking out her desired kindred."

"During the Monster Festival, the appearance of the man-eating plant on the surface was precisely because 'she' wanted to find individuals with similar powers, prompting Eriniou and the dark faction remnants to transport the plant, which acts as her tentacle, to the surface."

"Unfortunately, the plant was vanquished by me, but last time on the 24th floor, you still found that individual in the end."

And that was Ellie, as mentioned by Reveis.

And that was Ellie, as mentioned by the white-robed man.

And that was Ellie, who had a profound connection with Ais.

"Ellie is an Immortal Spirit."

"And Ais, she carries the blood of that Immortal Spirit within her."

"Ellie is Ais's mother, a human with Immortal Spirit lineage."

Why is Ais's "wind" so exceptional, so powerful?

The reason is very simple; it is because her "wind" is the legendary power of the Great Immortal Spirit, a miracle possessed by the godly incarnation capable of creating heroes.

"How is it? Am I detailed enough?"

"Do you still think I know nothing, understand nothing?"

"Or do you need me to even say your name before you acknowledge that I understand?"

At this point, Reiger looked at the white-robed man with eyes full of mockery.

"It's not impossible, though I had no intention to remember your name, but who am I to refuse good memory?"

"Let me reveal your identity."

"You are Olivias, once a member of the dark faction, until you died in the underground city and was transformed into a monster by the Polluted Immortal Spirit, completely betraying to Her side, and abandoning the dark faction."

"Am I not right?"

Upon those words, the monster named Olivias finally broke free from his freeze.

"You... you..."

Exposed and horrified, the monster stepped back several paces, the bone helmet on his face cracking and falling away.

Behind the helmet was the face of a white-haired man.

This was the true face of the white-robed man.