Decisive Battle—Age of Gods Minato vs. Six Paths Obito!
The so-called Age of Gods Mode was actually the Asura Chakra Mode that Shiro and the others had first researched.
The original Asura Chakra Mode used a specific method to gather and sublimate the Chakra of those who trusted you, thereby unleashing even greater power!
But once the technique's research was completed, a problem appeared.
According to Shiro's plan, no matter how things developed, Chakra could not exist during the final battle. At the very least, most people in the Shinobi World could not possess it, or when the God Tree revived, it would go berserk in order to reclaim all Chakra.
So that created another problem: if all the Chakra was gone, what was the point of training a Chakra Mode?
Therefore, Shiro and the others reconsidered another path. That was, instead of gathering the power of shinobi, they would gather the power of the world!
In the end, after their continuous research, they successfully transformed the method of connection between people into a method of connection between people and the world!
Of course, that step was only the beginning. What came afterward was the key: how to make the world trust you and share its power with you, how you would use that power, whether you could withstand it, and so on.
And once this entire series of problems had been solved, Minato's Age of Gods Mode appeared.
Age of Gods Mode could connect to the Mana Source like an Age of Gods magus and use the power of the Mana Source, but the difference was that an Age of Gods magus's Mana output was basically fixed, and that was connected to their Magic Circuits.
Age of Gods Mode was different. The output of Age of Gods Mode depended