Shinji had tested Ido's abilities before. When Ido left Yakumo's body in her Spirit Body form, she could move within a radius of about twenty-five kilometers from Yakumo.
Any farther, and Ido could no longer maintain her Spirit Body.
But after Yakumo had the Red Dragon Eye transplanted and successfully endured the First Hokage cell transplant, Ido's power had grown tremendously along with Yakumo's.
The most obvious improvement was that Ido's Spirit Body had become even stronger.
Now, as long as Yakumo gave her permission, she could move within a radius of about fifty kilometers from Yakumo.
Fifty kilometers!
That distance was beyond the detection range of practically every Sensory Ninjutsu and dōjutsu. Even Karin's ridiculously powerful Mind's Eye of the Kagura was useless at that range.
Yakumo could now use the Spirit Transformation Technique to launch surprise attacks on enemies within fifty kilometers, while her own body remained capable of defending itself, unlike Dan Katō's, which was left helpless when his Spirit Body departed.
At this point, the combination of Yakumo and Ido was already terrifying.
And yet they hadn't reached their limit.
The Red Dragon Eye's fearsome ability to control blood had once led Shinji to accidentally develop a secret technique called the Blood Clone Technique.
Only those who possessed the Red Dragon Eye could use this technique. Shinji had lost the eye and could no longer perform it, so he had taught Yakumo the secrets of the Blood Clone Technique.
Unexpectedly, this led Yakumo to discover another use for it.
When Yakumo used the Blood Clone Technique, Ido could enter the clone in her Spirit Body form and take control of it, greatly enhancing its abilities.
A Blood Clone with a physical body was already stronger than a Shadow Clone made purely from Chakra. Once Ido's Spirit