For Shiro Gen, the effects of [Yin Release Dominion (Purple)] far outstripped [Fire Release Dominion (Purple)].
Fire Release was only Fire Release.
Yin Release represented the essence of mind.
In truth, the so-called ocular power was Yin chakra.
With the purple entry [Yin Release Dominion], his mental force surged.
His five senses sharpened, and the world itself seemed to change within his perception.
With a thought, his chakra shifted to Yin nature in an instant, and to an extremely high degree.
When that high-quality Yin chakra poured into his three tomoe Sharingan,
the eyes began to evolve on their own.
Shiro Gen savored the evolution, as if peering into deeper secrets of Yin.
"The Sharingan is a bloodline limit of Yin nature, but not purely Yin."
"I can feel it. When Yin chakra reaches a certain quality and flows into the Sharingan, it is like a key opening a door."
"That door is the door of blood."
"In my blood, in the Uchiha blood, a vast power lies hidden."
"The union of Yin chakra and that power births the Mangekyo Sharingan."
"It also produces might that makes wishes come true."
[Three Tomoe Sharingan (Blue)] -> [Mangekyo Sharingan (Purple)]
[Mangekyo Sharingan (Purple): Greatly raises the quality and quantity of chakra, greatly enhances eyesight, grants three base abilities - Insight Eye, Hypnosis Eye, Copy Eye - and grants three ocular arts: Amaterasu-Imperator, Tsukuyomi-Deity, and Susanoo. However, each use of a Mangekyo art reduces sight until vision is lost forever.]
[Amaterasu-Imperator: Ignite the flames of Amaterasu-Imperator, allowing compatible entries to be smelted into one.]
[Tsukuyomi-Deity: Behold the entries of all things. Upon killing or destroying, seize their entries.]
In the crimson irises, the three tomoe joined into shapes. The left eye seemed a black sun, the right a scarlet crescent.
"This overwhelming sense of power..."
"It is intoxicating."
Chakra of high purity roared through his body like a river in flood, vast and inexhaustible.
The black sun and blood moon of the Mangekyo turned, and ocular force rolled out like day and night.
He gazed upon the world with the Mangekyo.
Everything was perfectly clear.
"It is as if I can see a new world."
"And my Mangekyo arts, bent by my talent, have become part of that talent."
"Simply put, Tsukuyomi-Deity plunders entries, Amaterasu-Imperator fuses entries."
"To plunder, I need targets that have entries."
"But fusion... I can try that now."
A peculiar sense told him that among all his entries,
only [Fire Release Dominion (Purple)] and [Yin Release Dominion (Purple)] could be smelted into one, birthing a new purple entry - which meant a new bloodline limit.
He knew Bloodline Aggregate stood among the world's ultimate powers.
Leaping there in one bound would be too hard.
Since he possessed a Mangekyo art that fused entries,
he would take it step by step: master multiple bloodline limits, then multiple bloodline selections, build them up, and at last grasp the Bloodline Aggregate.
Resolved, he moved at once.
He focused Amaterasu-Imperator upon [Fire Release Dominion (Purple)] and [Yin Release Dominion (Purple)].
Yin chakra poured from him without end, channeling into his left eye.
The black sun released invisible black fire and set both entries alight.
Only he could see the black fire of Amaterasu-Imperator.
It shrouded both purple entries completely.
Slowly, slowly,
the two began to melt together.
By the time his chakra was nearly spent and the sight in his left eye had dimmed by nearly one third,
a new purple entry finally formed.
[Flame Release Dominion (Purple): A bloodline limit born from fusing Fire Release and Yin Release. It possesses properties of free shaping, free motion, ignition of all things, unquenchable burning, and radiance that casts genjutsu. You have absolute dominion over Flame Release, and its dominion includes all effects of Fire Release Dominion and Yin Release Dominion.]
He opened his palm and black flame surged up.
"Flame Release really does resemble the fire of Amaterasu."
"As a bloodline limit, it feels like a synthesis of Amaterasu and Kagutsuchi."
"There are differences, but more similarities."
"That is good."
With a thought, under his control, the black flame condensed into a sword of Flame Release, a blade of midnight fire.
"Based on Flame Release, I can comprehensively optimize Shiro Gen-ryu - Phantom-Blaze Radiant Blade, Fire Release Chakra Mode - Armor of Fire, and the Flame-Sword Phantom Body."
"And the road map is perfectly clear."
"First, the Phantom-Blaze Radiant Blade. Since Flame Release naturally emits the light of illusion, I no longer need to weave genjutsu into it."
"That lets me pursue more extreme speed and destruction."
"For the armor, the fix is simple. Replace Fire chakra with Flame chakra while keeping the structure. That yields Flame Release Chakra Mode - Armor of Flame."
"Of course, I can tweak the structure to suit Flame chakra and make the armor even stronger."
"As for the Flame-Sword Phantom Body, I only need to substitute Flame chakra for Fire chakra and make fine adjustments. I do not even need a new name."
These thoughts flashed through him.
Then he tested his left eye.
"Amaterasu-Imperator is incredibly powerful. One use, and I gained a formidable bloodline limit."
"In the future I might use it to pursue the Bloodline Aggregate."
"But the cost is massive."
"One use drained my chakra near empty."
"Chakra is not the problem. The point is sight."
"One use reduced my vision by one third."
"So three uses, and the left eye goes blind?"
"A frightening price."
"Luckily, the Mangekyo can still evolve. With Eternal Mangekyo, I can use these arts freely."
"For me, I need only raise [Yin Release Dominion (Purple)] to [Yin Release Sovereign (Gold)], and [Mangekyo Sharingan (Purple)] will evolve to [Eternal Mangekyo Sharingan (Gold)]."
Although [Yin Release Dominion (Purple)] and [Fire Release Dominion (Purple)] fused into [Flame Release Dominion (Purple)],
the original entries did not vanish. They became part of [Flame Release Dominion (Purple)].