Chapter 817 - 639: Then Let Me Teach You

"I want to learn."

Seeing the intense desire in the eyes of the blonde-haired, golden-eyed swordswoman, Reiger couldn’t help but chuckle.

"You want to learn it?"

He reconfirmed.

"Yes!"

Ais immediately nodded without hesitation.

This so-called Breath of Wind seemed perfect for her, and Ais naturally couldn’t resist wanting to learn it.

Not only would the power of [Wind Spirit Swift Walk] increase, but the burden on her body would decrease. She could even unleash those sword skills capable of performing a Gale Slash, which made Ais fully understand that once she learned Reiger’s Breath of Wind, her strength would gain another significant boost.

The prospect of increasing her power was reason enough for Ais to commit to learning the Breath of Wind.

"Then I’ll teach you."

Reiger responded to Ais with a smile.

The reason he showcased the Breath of Wind was precisely to help Ais improve her strength.

When he was still weak, Ais generously guided him, taught him magic, sword skills, and sparred with him. Now that he had grown, it was only natural to reciprocate and help Ais become stronger.

Becoming stronger was Ais’s wish, her determination.

Understanding this, Reiger, being able to help Ais, naturally wouldn’t hesitate.

At this moment, Theona raised her hand.

"Me, me, me! I also want to learn!"

The Amazon’s strong assertion made many present also show a yearning look.

Unfortunately, Reiger did not agree this time.

"You all better forget it, it’s not worth it."

Reiger said, which first made Theona dissatisfied.

"Why can you teach Ais but not me?" Theona exclaimed, "That’s so sneaky! Only you two get to secretly get stronger!"

"Exactly." Theone also agreed, crossing her arms and saying, "If only you two are getting stronger, even we’d get jealous, you know?"

Seeing Reiger suppressing Ais who had just advanced to Lv.6 despite being at Lv.5 himself, the Amazon twins and the first-rank adventurers of the familia had to admit that Reiger might already be stronger than them now.

Moreover, by a considerable margin.

This made Theona anxious, Theone slightly resentful, and Bert seemed irked, as if something had been taken from him.

If they knew that Reiger was actually holding back, that the strength he just displayed was not even a tenth of his full capabilities, they might just go berserk, right?

Reiger shook his head helplessly and addressed everyone.

"It’s not that I’m unwilling to teach you, but it’s genuinely not worthwhile."

From the perspective of this world, breathing techniques are quite unique, but that’s all they are.

They were developed to allow ordinary humans to temporarily match the strength of demons, and their actual utility is quite limited.

There’s no help for it, after all, the Demon Slayer World doesn’t have a high level of mystique or power, at least not compared to the Earth Mistake World.

A character as overpowered as Tsukiguni Yoriichi, if born in the Earth Mistake World and received the blessing of the gods, with his boundless potential, could undoubtedly reach Lv.5 within a few months, like Reiger or the protagonist of the Earth Mistake World, becoming a first-rank adventurer, and possibly breaking through the limits of capabilities to reach the SS or SSS stage beyond ordinary reach.

But in the Demon Slayer World, Tsukiguni Yoriichi lived for over eighty years and only reached power comparable to the peak of Lv.6.

If he hadn’t encountered Reiger and been inspired by the new Sun Breathing from Reiger, Tsukiguni Yoriichi wouldn’t have even reached Lv.7.

Thus, it’s clear that breathing techniques have their limits, at least for those adventurers who have received the blessing of the gods.

Each ascension (level-up) for adventurers is a leap in life.

Their "vessel" evolves.

Their potential is further unleashed.

As long as they ascend (level-up), it’s a step towards the realm of the gods, the higher the level, the closer to the divine.

Hence, for Finn, Theona, and others at their level, even if the breathing techniques still have some effect, it will eventually fade.

How can life forms that have transcended mortal flesh and are gradually nearing the realm of gods enhance their cardio-pulmonary functions through breathing to accelerate blood flow and improve physical ability?

Their cardio-pulmonary function is already strong, and their physique is like a superhuman’s. Enhancing this already powerful cardio-pulmonary function and physique through breathing—is it realistic?

Not at all realistic.

Furthermore, unlike people from other worlds, relying on the blessing of the gods, they can increase their ability proficiency and gradually become stronger just by continuously using various skills, and achieve remarkable feats to level up, causing their power to surge. If they have time to spend on a skill that will eventually lose its effectiveness, it’s more practical to diligently explore the underground city.

In light of this, after careful consideration, Reiger decided not to teach the breath technique to his familia companions.

Especially not to first-rank adventurers like Finn, who have battled in the underground city for years, fighting numerous monsters. Their combat systems are already well-developed, unlike Liz, who was slightly naïve in various aspects, and it doesn’t suit them to suddenly learn a different combat system.

If that kind of combat system was powerful, it might still be acceptable, but since it will eventually lose effectiveness and its benefits are limited, it’s better not to pursue it.