Ten days later, Ron finished his stay in Begrossé. Machi drove the car toward the airship terminal, where tickets had already been purchased in advance. With the airship, they could head directly to the city where Heaven's Arena was located.
Once aboard, Ron entered Sumas's space. With the addition of several powerful spirits, the Rotten Life Blade's cockroaches attached themselves to them and greedily absorbed their aura, quickly enriching the ark. This increase in available aura provided a useful boost to his team's overall strength. Whenever members used Zodiac Cards, they could now draw first from the cards stored aura instead of their own.
A colorless crystal orb floated before Ron, its progress already at one hundred percent. Closing his eyes, he gave the command.
"Begin."
In the next moment, Ron felt his aura rush into the orb at immense speed. The scene matched what he had experienced many times before.
Bang!
The sound rang inside his mind, and his consciousness seemed to sink into another space. Faint images appeared before his eyes: a woman with long blue hair holding a massive organ, a crimson bird spiraling through the sky, a youth with a flute, a mecha floating in space. All of them merged into the crystal orb.
Boom!
The violent sound burst forth, and Ron felt his consciousness withdraw at high speed. Before long, he opened his eyes. With a thought, he summoned her.
A woman appeared before him, her long blue hair and eyes shining with the same hue, clad in a yellow dress, radiating a powerful aura that had already reached A-rank. Information flooded Ron's mind.
Her name was Yuzuru Yamai. She came from the world of Date A Live. She was a Spirit. Her primary ability was called the Diva of Destruction, and her techniques included the March, the Solo, the Rondo, and the Requiem.
The March granted additional strength to designated listeners.
The Solo allowed her to control the thoughts of a designated listener.
The Rondo unleashed immense destructive power through overwhelming sound.
The Requiem calmed the designated listener.
Ron examined her carefully. An auxiliary-type Nen beast, capable of strengthening allies, controlling enemies, unleashing limited destructive power, and alleviating allies pain to indirectly enhance their combat performance.
"Not bad," Ron murmured. "This can further raise the strength of Natsu and Uchiha Sasuke."
Compared to pure front-line fighters, Ron preferred support-oriented Nen beasts like Yuzuru Yamai. Natsu and Sasuke already had excellent raw combat power.
"Let's test it."
Bringing Natsu, Sasuke, and Yuzuru Yamai to an open space, Ron issued the order.
"Yuzuru Yamai, use the March."
She began to play, and soothing music spread forth. By Ron's arrangement, only Natsu was affected while Sasuke remained untouched.
"The ability can target specific listeners. Convenient—no risk of accidentally strengthening enemies."
Natsu inhaled sharply.
"Fire Dragon's Roar!"
A torrent of flame surged forward toward Sasuke.
Bang!
The immense force forced Sasuke back again and again. Ron's eyes lit up.
"Under the March's effect, Natsu's attack power rose by about thirty percent. Impressive. Very few Nen users can produce such an enhancement."
"Continue. Yuzuru Yamai, use the Solo."
This time, the targets were not Natsu or Sasuke but several prisoners Ron drew from the Library Prison. Their strengths varied, from C-rank to A-rank.
As the Solo's sound reached them, the effect was immediate. The B-rank and C-rank users were controlled almost instantly. The A-rank resisted far longer, but even he only lasted a few seconds before being controlled. However, he soon broke the control right after. The B-rank remained under control for half a minute, while the C-rank stayed controlled indefinitely until Yuzuru Yamai dismissed it.
"The effect is weaker than Nina's ability. But Nina's strong control can only lock onto a single target at a time. Yuzuru Yamai can influence multiple people at once—perfect for clearing weaker enemies. Against stronger foes, even a brief moment of control can decide the battle."
Ron returned the prisoners to the Library Prison and brought Natsu and Sasuke back into the test area.
"Yuzuru Yamai, use the Rondo."
Her music swelled, unleashing sound waves like crashing ocean waves.
Boom!
Both Nen beasts were forced backward. The scene reminded Ron of martial arts films where blind musicians unleashed devastating sound-based attacks, though Yuzuru Yamai's power clearly surpassed theirs.
"For an auxiliary-type Nen beast, this level of offensive ability is already excellent."
"Continue. Yuzuru Yamai, use the Requiem."
A prisoner appeared, and Sasuke stepped forward, quickly slashing several deep wounds into the man's body. Blood flowed as he grimaced in pain. But when the Requiem fell over him, the visible agony eased noticeably.
"Equivalent to an anesthetic effect. It cannot heal injuries, only numb the nerves. Against ordinary people, this has strong utility. Against Nen users, whose wills are firm, the effect is much weaker."