Uzumaki Karin's combat power was not outstanding, but her support abilities were absolutely top-tier.
Her Chakra reserves, self-healing ability, sensory ability, and Sealing Technique could almost perfectly compensate for the shortcomings Uchiha Gen lacked.
Or rather, such comprehensive support abilities could complement almost any Ninja.
As for the potential value of Yang Release within her body, it was even greater. Combined with Medical Ninjutsu, even with just a little development, it could achieve such results. If he could learn the Regenerative Technique, it was highly likely that, relying on his own massive Chakra reserves and Yang Release, he could act as a high-level medical team on his own, performing this technique solo and achieving an effect close to the Yin Seal in a roundabout way.
Even if the effect might not be as strong as Tsunade with the Yin Seal active, as long as he could apply Uzumaki Karin's Yang Release talent—where a single bite could restore half a life's worth of health—it would already be quite satisfactory.
After exploring the most valuable character card, what remained were five item cards.
[Item Cards: exploding tag × 3 (White), Training Acceleration Card (White), Training Acceleration Card (Green), Quality Upgrade Card (Green), weapon enhancement card (Blue)]
"The exploding tag card can be ignored. Using the two Training Acceleration Cards—one green and one white—as usual will save me two and a half months. It's just enough time to complete the final Wind Release Nature Transformation, and if there's extra time, I can also study Water Release."
Ever since he obtained the incomplete Sage Body of the young Tsunade, the Chakra attributes she possessed were also inherited along with the Senju Constitution.
Uchiha Gen's own Chakra attributes were primarily Fire and Wind, plus Yin Release which manifested due to the Sharingan. Tsunade, on the other hand, possessed all attributes except for Yin Release and Wind Release, which perfectly filled in this gap.
He was now a Ninja possessing all attributes. Aside from Kekkei Genkai, any secret technique, as long as it didn't involve Nature Transformation, could be easily copied, so naturally, he could also learn Water Release.
If he wanted to, he could be like Kakashi from the original work, copying thousands of Ninjutsu and earning the title of Copy Ninja.
It was just that he already had his own combat style, so there was no need to use Kakashi's style.
Moreover, by the time of the Shippuden era, Kakashi's combat style no longer relied on those, but rather, he had built a combat system with Lightning Release as the core, Earth Release and Taijutsu as support, and the Kamui Sharingan as a trump card.
"The Quality Upgrade Card can be saved for future needs. Aside from the character card, the most important item from this draw is this blue-quality weapon enhancement card."
Uchiha Gen drew the Sengoku Ninja Sword from his waist.
The cold moonlight shone on the matte black metal blade, reflecting a unique brilliance.
Even though it wasn't stained with blood, it exuded a chilling aura of malevolence.
This sword, which had accompanied Uchiha Madara since his youth in battle, had been passed down to the present day. In Uchiha Gen's hands, it had also drunk its fill of blood, sending who knows how many Ninjas to the Pure Land.
Coupled with several green card enhancements, it had already faintly begun to reveal a hint of the extraordinary.
[Weapon: Sengoku Ninja Sword (Green) ++++]
[Current weapon quality has been enhanced to the limit. If you wish to continue enhancing, please use a higher-quality enhancement card.]
[Use weapon enhancement card (Blue)?]
[Yes.]
[Enhancing ————]
[Weapon quality is upgrading ———— Current weapon quality has reached Blue. You can unlock affix options. The current quality enhancement effect grants a blue affix. Randomly drawing affixes ————]
[The current optional affixes are as follows:]
[1. Sharpness Enhancement +1: Enhances sharpness, increasing armor-piercing ability against armor and defensive Ninjutsu.]
[2. Killing Intent Enhancement +1: The user can use their own will to resonate with the malevolence within the weapon, allowing them to assault the spirit of enemies directly in front of them.]
[3. Flame Attachment +1: Increases the power of Fire-related abilities released through this weapon.]
[4. Lightning Attachment +1: Increases the power of Lightning-related abilities released through this weapon.]
The four affixes were all related to how Uchiha Gen had previously used this ninja sword in combat.
Sharpness Enhancement, he guessed, would be present on any sharpened weapon. Killing Intent Enhancement was likely similar; as long as one killed enough people with this weapon, one would get this affix.
The third and fourth, Flame and Lightning Attachment, were likely due to the Uchiha Style Swordsmanship and Hatake Style swordsmanship he practiced daily.
"The second affix can be ruled out first. I already have the Genjutsu of the Sharingan; the mental shock effect of Killing Intent overlaps with it, and its power cannot exceed the Sharingan. The remaining three are all related to attack."
"The Flame affix corresponds to Uchiha Style Swordsmanship, and the Lightning affix corresponds to Hatake Style swordsmanship; they are too specialized. On the other hand, simply increasing sharpness might not be as good in specialized effects as the other two, but it has a wider range of applicable scenarios. Let's go with this one."
After a brief screening in his mind, Uchiha Gen quickly made his choice.
[Affix selected: Sharpness Enhancement.]
[Enhancing ————]
The blue weapon enhancement card shattered at this moment, turning into specks of blue light, converging into a phantom of a hammer burning with blue flames, striking the Sengoku Ninja Sword.
Until the phantom disappeared, the system's next prompt also appeared.
[Enhancement successful!]
Uchiha Gen refocused his gaze on the Sengoku Ninja Sword and discovered that although it was still the same sword, it looked slightly different from before the enhancement.
The feel hadn't changed, but the luster on the blade was sharper and more biting.
In the past, although this sword was of high quality, it looked low-key and archaic; at a glance, it didn't look much different from an ordinary old-style ninja sword. But now, the luster on its blade and the faintly revealed killing intent made it clear at a glance that this was no ordinary item.
[Weapon Name: Sengoku Ninja Sword]
[Quality: Blue]
[Affix: Sharpness Enhancement]
Uchiha Gen held the Sengoku Ninja Sword horizontally in front of him, reaching out to touch the cold blade.
His fingers brushed past the edge of the blade; before even touching it, he felt a faint stinging sensation, as if he would surely be cut by this vicious weapon just by getting slightly close.
Gripping the hilt, he slashed forward lightly, feeling almost zero air resistance.
With a slight effort, he easily sliced through a tree in front of him; the difficulty didn't seem any greater than slicing a piece of tofu.
Fluid and incredibly smooth.
The effect of this Sharpness Enhancement immediately satisfied Uchiha Gen.
Injecting Chakra into it, a rather smooth feeling came from the blade.
Sharpness Enhancement was an additional effect of the affix, while the Sengoku Ninja Sword's quality jumped from Green to Blue, meaning the sword's quality in other aspects was also rising, such as Chakra conductivity.