"This is it?"
Third Raikage, who had been prepared for a prolonged battle and the pain it would bring, was a little dumbfounded. Was it really this fast?
"Fusion itself isn't difficult. The key is that it consumes a tremendous amount of energy. If Samehada hadn't swallowed quite a few Sharingan before, and didn't possess some regenerative ability of its own, it would never have been able to support the fusion of a Kekkei Tōta."
Tamura Hiroshi withdrew his palm and explained. It looked easy, but the consumption had truly been enormous.
"How enormous? If we were fusing a Kekkei Genkai, could this be made widespread?"
Third Raikage asked while adapting to and controlling that entirely new chakra.
"Fusing a Kekkei Genkai requires all the Dojutsu Power of one Mangekyo, and consumes more than ten cards' worth of chakra. Fusing a Kekkei Tōta increases the cost tenfold.
"Moreover, Kekkei Tōta fusion is the limit. It can't go any higher, since this is only a Mangekyo technique."
The consumption was genuinely massive. Clearly, the more attributes were fused, the greater the cost—and it increased tenfold each time.
Fusing a dual-attribute Kekkei Genkai required the Dojutsu Power of one Mangekyo and ten cards of chakra. A three-attribute Kekkei Tōta required ten Mangekyo's worth of Dojutsu Power and more than a hundred cards of chakra.
By that calculation, fusing a seven-attribute Kekkei Tōta would require Dojutsu Power equivalent to a hundred thousand Mangekyo and more than a million cards of chakra.
No wonder even Madara Uchiha had needed to become a Ten-Tails Jinchuriki before he could create Truth-Seeking Orbs. And although Truth-Seeking Orbs were Kekkei Mōra, they were not a complete Kekkei Mōra.
This showed just how difficult fusing a Kekkei Mōra was. This Dojutsu could certainly never fuse one, since it was