Besides, Yakumo Kurama's abilities went far beyond that.
She also possessed an ability known as True Illusion Manifestation.
In the Illusionary World Yakumo created, anything that happened could become real if she wanted it to, including inflicting or healing injuries to objects and people.
The scenes she painted on her canvas could also become reality, if she wanted them to.
For example, in the original story, Yakumo merely painted a picture of the Hokage Building being struck by lightning. The next second, the building really was struck by lightning and caught fire, nearly burning to the ground.
This ability was a little like the story of Magic Brush Ma Liang that Hao Shuai had heard as a child.
Most people might have considered it a special kekkei genkai, but Hao Shuai thought True Illusion Manifestation involved a certain degree of materialization.
After all, materialization was an ability only the truly powerful could master.
Even Hao Shuai had no clue how to do it at the moment. He figured that the only way he could manage it was to get the Reality Stone in Marvel someday and use its power.
Yet Yakumo could achieve similar effects through painting and other means.
That made Hao Shuai very interested, and he wanted to investigate her abilities further.
So after Yakumo moved in, Hao Shuai taught her how to strengthen her body while also studying her abilities.
Unfortunately, Hao Shuai wasn't a researcher, and after half a year, he hadn't figured out a thing.
On the other hand, after half a year of training, Yakumo's physique had become almost as strong as an ordinary Genin's—not as strong as Rock Lee's or Naruto's, but still impressive.
At that point, Hao Shuai gave up on trying to be a researcher and decided to leave the investigation