Because of the positive and negative experience points, the abilities or items he could exchange from the System were all related to medical treatment.
Therefore, some familiar techniques in his memory did not exist in the inventory.
This included some mass-destruction Ninjutsu or Bloodline Limits in this world.
Otherwise... he would have more choices.
He searched for a long time; the resources that could be exchanged with negative experience points all possessed darkened attributes... After conversion, ability-type resources would also be limited by the amount of Chakra, just like the Scarlet Blood Manipulation Technique.
Comparing them like this, those with poor effects were not even as good as the Scarlet Blood Manipulation Technique, so there was no need for extra expenditure.
Those with strong effects... were indeed tempting to look at.
But... he couldn't afford them.
"There are also many area-of-effect techniques, but after the System's conversion, the upper limit of the abilities is relatively low... They would still need to be developed later. Setting aside whether it's difficult or not, it's a bit of a waste of time." After looking through them once, he opened the System's item interface; he had been focusing on abilities before and seemed to have rarely noticed the item options.
military music dream (Flute Teigu): From Akame ga Kill!
Effect: Capable of freely manipulating the target's emotions; can be used on the battlefield to boost morale. It can manipulate dozens of emotions, but targets will develop resistance to the music if they hear it repeatedly.
Secret Technique: Demon Summoning (can strengthen the user).
(Note: This item is a specific anti-enemy item. After exchange, the resources of that world will be locked, but can be recycled to unlock.)
"Hmm?"
Yubi's heart stirred.
He had actually watched Akame ga Kill!, that magical 'healing anime.'
There were dozens of Teigu and Shingu in it, and the one that left the deepest impression on him was the ice Teigu 'Demon's Extract,' which could freeze everything... Its power was simply Heaven-Defying.
But unfortunately, that thing wasn't available... Even if it were, the cost in experience points would likely be astronomical.
It could perfectly satisfy his need for large-scale destruction and extreme destructive power.
And he had some impression of this flute... Its power was okay, but it was overshadowed and weakened by the prominence of other Teigu.
It was more like an auxiliary tool.
Presumably, because it involved hypnosis, spirit, emotions, and other levels, it was included in the System's resource library.
It was also related to medical treatment.
Besides military music dream, Yubi also saw another Teigu, 'Spectator.' Compared to the flute, the effect of this Teigu was somewhat more terrifying.
It grants the user five types of abilities: Insight, Farsight, X-ray Vision, Precognition, and Illusion.
Insight allows one to see through the opponent's thoughts by observing their expressions; Farsight allows one to see distant objects; X-ray Vision allows one to see the target regardless of obstacles; Precognition allows one to see what happens next through the subtle movements of the target's muscles; Illusion allows the opponent to see hallucinations.
From the description, it seemed more like giving the user a powerful Bloodline Limit-type Dojutsu.
He wondered... how its effect compared to the Sharingan.
Its inclusion was likely due to the 'X-ray Vision' aspect... While browsing the exchange list for positive experience points, Yubi had also discovered some X-ray Vision abilities, which for a doctor, were similar to human X-rays.
The price tag for this Teigu was???... Obviously, he couldn't afford it now, and the System didn't even bother to display the price.
"Hmm... there are also items and tools for controlling corpses... that makes sense..."
Yubi scrolled through the interface for a while longer and found that the System's requirements for item exchanges were stricter, and the prices were higher.
The cost-performance ratio wasn't as good as for abilities.
So, after browsing around, he locked his gaze on the Teigu military music dream again.
Firstly, this item's price was relatively low, and it could be recycled by the System, so he wasn't afraid of being stuck with it.
Secondly, and most importantly, even after being converted by the System, the requirement for the user's Chakra reserves wasn't high. It only required a certain amount of Chakra output to cause a large-scale area effect... This was very appealing to Yubi.
This thing's demand for Chakra quantity wasn't as direct as abilities.
Moreover, the role this Teigu could play on the battlefield would be very obvious.
It could also provide help in one-on-one situations.
Although targets would develop resistance... its true value still couldn't be ignored.
"A flute... it's somewhat like the techniques of Tayuya from the Sound Four in later generations. However... her Ninjutsu combines Genjutsu and is a manifestation of Yin Release energy, mainly for solo combat. The power of this Teigu, military music dream, on the battlefield is definitely far beyond what she can compare to... Although it can't cause the large-scale destruction I hope for... interfering with enemies on a large scale won't be too bad either. The main thing is that it's ready to use right after purchase."
Yubi considered it for a moment.
There is Sound Release in Naruto, but it's not the kind of Ninjutsu used by the Sound Four. Their Ninjutsu is just through the change and control of Chakra, urged out with the help of some equipment. True Sound Release is also a Bloodline Limit, appearing in the Land of Snow arc of the original work.
"After conversion, it will likely become a special secret treasure, definitely not a conventional ninja tool..." Yubi's eyes flickered.
There are many items of this type in the Ninja World.
For example, the blades of the future Seven Ninja Swordsmen of the Mist... but their effects naturally can't compare to a Teigu.
If one were to say what's most similar, it would be the Six Paths Ninja Tools.
Besides ninja tools, there are also Divine Artifacts in Naruto... Yubi didn't exchange it immediately; he was thinking about some issues.
Issues involving the Village level.
After a short while, he thought about it... and bought it anyway.
[Ding! Would you like to exchange for this item?]
"Yes!"
[Assimilating the item... Please wait...]
[Congratulations to the host for obtaining a special exclusive ninja tool.]
Following Yubi's response.
A few seconds later, a pitch-black vertical flute appeared in his hand.
Three thousand negative experience points were deducted, leaving less than one thousand negative experience points.
Yubi pondered for a moment and extended the skills of his Scarlet Blood Manipulation Technique, purchasing a Cursed Womb effect. Some special techniques can only be used with a Cursed Womb body.
Later on... Yubi planned to purchase other Cursed Womb effects and a full set of Scarlet Blood Manipulation Technique techniques, which could save time for his own development.
He wouldn't have to study them himself.
Because looking at the situation, he probably wouldn't have any spare time to put into personal cultivation.
Originally, he wanted to save on these expenses, but the current battlefield's requirement for individual ability was also very high.
He wasn't going to waste that energy.
Once all subsequent techniques could directly become Bloodline Limit Ninjutsu... his Bloodline Limit ability would be considered to have reached Major Achievement.
When he had free time, he would research it himself.
He took an interest in this Teigu also because there would be some experience points left over, which could just happen to improve his personal strength... so as to have better survivability on the battlefield and deal with various situations.
"I don't know if I made the right purchase... let's leave it at this for now."
Yubi sighed softly as he watched the positive and negative 'balances' in the experience bar instantly hit rock bottom.
Immediately after, exhausted as he was, he fell straight asleep.