After Minato left, Mu Yue looked at the Flying Thunder God Technique on the panel, marked as beginner-level, and immediately clicked on the Ninjutsu Mastery Scroll in his inventory.
Considering how difficult powerful Ninjutsu were to train, Mu Yue rarely used Ninjutsu Proficiency Scrolls. Aside from testing one when he first obtained them, he had only used a few on Medical Ninjutsu. The sole Ninjutsu Mastery Scroll had been kept unused until now.
After opening it, Mu Yue saw a long list of Ninjutsu. He only needed to select one, then confirm it, to raise that Ninjutsu to mastery level. If the Ninjutsu was already at mastery level, its proficiency would increase instead.
Ignoring the other Ninjutsu, Mu Yue quickly found the Flying Thunder God Technique, which had only one point of proficiency.
Ninjutsu Mastery Scroll consumed. Skill proficiency increased—Flying Thunder God Technique (Mastery Level: 1/15000)
The instant he allocated the points, a flood of memories regarding Flying Thunder God training surged into Mu Yue's mind. Questions he had once found profound and incomprehensible became clear in an instant, to the point that he felt, That's all there is to it?
Once Flying Thunder God reached mastery level, Mu Yue's understanding of it entered an entirely new realm.
First, he could confirm that a homebound Mu Yue was possible. Flying Thunder God's travel distance had two major limitations: sensory range and Chakra reserves.
If Mu Yue's sensory range could cover the entire ninja world, and he possessed enough Chakra to use Flying Thunder God from anywhere in the ninja world to return home, then he could become a homebound Mu Yue—returning home to rest whenever he got tired of fighting, then launching another attack while his enemy was off guard.
Of course, if he had that much Chakra,