Three hundred million points of Wish Power had to be spent strategically to yield the greatest value. After careful consideration, Nawaki finally settled on an exchange plan.
The Rinnegan, which cost five hundred million points, was the first thing Nawaki ruled out! It was not merely because he lacked sufficient Wish Power; in fact, Nawaki had already decided that even if he had enough Wish Power in the future, he would never exchange for a Rinnegan again.
Nawaki, who possessed both the Asura Bloodline and the Eternal Mangekyō Sharingan, already met the basic conditions for awakening the Rinnegan. However, because his spiritual transformation and Yin-Yang Release could not merge, he had never managed to nurture his right eye into a Rinnegan.
After years of cultivation, refining qi into spirit, combined with continuously using the Rinnegan's ocular power in his left eye to nourish his six spiritual senses, Nawaki felt that he was drawing ever closer to the Yin Spirit realm. At most, it would take a few more years for the six senses to completely unite and condense into a Yin Spirit.
Nawaki deduced that once he condensed his Yin Spirit, the Yin Release within his body would reach its utmost limit and form a trace of True Yang. When that merged with the extreme Yang chakra of the Asura Bloodline, his left eye would naturally evolve from an Eternal Mangekyō into a Rinnegan. There was no need to waste a full five hundred million points of Wish Power just to save a few years.
Moreover, Nawaki already possessed a Six-Tomoe Rinnegan. With that eye, he could likewise perform Outer Path techniques and Six Paths techniques. Even if he exchanged for another Rinnegan, it would merely double his ocular power. It would not bring a qualitative leap in his strength.