It was unclear why Precht had turned to darkness, founded Grimoire Heart, and become obsessed with reviving the Black Mage Zeref to usher in a Great magic Era.
But since he had committed so many atrocities and intended to continue, he could not be ignored.
Especially since he was the former Second Master of the guild, the guild had all the more reason to clean house.
Consequently, Makarov and the rest of the guild began a comprehensive and in-depth discussion regarding the plan to destroy Grimoire Heart.
Naturally, Goku had no interest in this discussion process and went straight back to sleep.
What he was interested in were the Master, Deputy Master, and the series of experts within Grimoire Heart.
According to his idea, he would simply have Ultear take him to the headquarters of Grimoire Heart.
Then, he would naturally have a spectacular fight and knock down all the experts.
The matter would be resolved, and he would have improved as well.
Unfortunately, everyone felt his plan was far too simple and crude; to his surprise, no one agreed with it except for Natsu.
Therefore, he could only wait for Grandpa Makarov and the others to formulate a plan and notify him when it was time to take action.
Upon waking up and learning from Mirajane about the general plan formulated last night, he realized he wouldn't be fighting anytime soon, so he decided to return to Hogwarts to find Grandpa Dumbledore.
"Is everything resolved?"
In the Headmaster's office, Dumbledore was not too surprised to see Goku appear.
Goku shook his head and explained the situation at the guild: "They need to formulate a plan against the dark guild, which will take some time..."
"Facing such opponents, one needs to take it slow; there is no need to rush."
Dumbledore quite approved of the guild's plan against Grimoire Heart.
Previously, Grimoire Heart was in the shadows while Fairy Tail was in the light; now that the roles were reversed, they certainly had to make good use of their advantages.
They needed to resolve the issue with as few casualties as possible.
Goku's method was only suitable for Goku himself.
"Since their preparations will take some time, you can take this opportunity to complete the Animagus ritual."
"That's what I was thinking, too."
Goku nodded.
Next, Dumbledore began to explain all the steps of the customized Animagus transformation ritual for Goku.
In fact, it was largely the same as the standard Animagus ritual, just with many changes in some of the details.
For instance, in the final brewing of the potion, Goku's blood and many magic Materials to stabilize the mind were added.
The ritual also utilized the tail Goku had retrieved.
"Now, keep this leaf in your mouth. Remember, the leaf must never leave your mouth. To be safe, you should refrain from speaking for this month."
Dumbledore placed a leaf into Goku's hand, and Goku tucked it into his mouth.
The first step of the Animagus transformation ritual was to keep a Mandrake leaf in one's mouth for a full month.
It must not fall out at any point, or one would have to start all over again.
"Come back after a month, and then we will continue with the rest of the ritual."
Seeing that Goku had the leaf in his mouth, Dumbledore thought for a moment and asked him, "Goku, I would like to go to that World of Mages with you. Can you bring me back after a month?"
Goku blinked and nodded without hesitation.
He didn't understand why that wouldn't be possible; it wasn't any trouble at all.
For people he trusted, as long as they were willing, he didn't mind taking them to other Worlds to adventure and train together.
Sometimes, he might even need help from these friends from different Worlds.
He couldn't possibly learn everything in every World; he would only focus on learning techniques that helped improve his own strength.
So, sometimes when he encountered trouble, he needed to ask friends for help.
Just like this time, facing Ul's Absolute Zero magic, he could destroy the Absolute Zero with a Kamehameha, but he couldn't dispel it.
And at that moment, he needed to find Dumbledore for help.
He felt that adventuring in different Worlds, training in different Worlds, and making friends from different Worlds was a very interesting and happy thing.
It was also a very interesting and happy thing.
When everyone was in need, they could also help each other.
For instance, if Lord Voldemort were to revive, and he couldn't go to Hogwarts to help because he had other matters to attend to.
He could send Natsu, Gray, and Erza and the others to Hogwarts to help deal with Lord Voldemort, and then bring them back once he was done.
"Alright, wait for me a moment. I'll go and have a word with the Four Deans."
Although he knew Goku wouldn't refuse, Dumbledore still breathed a sigh of relief when he saw Goku nod.
In less than an hour, he returned to the Headmaster's office.
"Let's go!"
As Headmaster, he didn't have to teach classes, so if there were no major incidents, he was actually quite free every day.
Therefore, even leaving for a month wouldn't have any impact on the school.
Besides, the Little Wizards at school were now very powerful in actual combat because they had been practicing Ki Magic.
There was also Hagrid as a trump card, and the Four Deans were there.
Even if Lord Voldemort were to revive and try to cause trouble, it probably wouldn't be that easy.
After some time, once he had exchanged knowledge with the World of Mages and learned more destructive magic from there, he could pass it on to the students.
Then, he would be even less afraid of Lord Voldemort's revival.
The Ki Magic that Goku taught was certainly powerful, but it was too strenuous, and only a few could persist.
The magic from the World of Mages was not as powerful as Ki Magic, but at least it wasn't as strenuous to learn.
Most of the Little Wizards could accept it.
With the Mandrake leaf in his mouth, Goku couldn't speak, so he took out his box and put Dumbledore inside.
He closed his eyes, leaned against the wall, and fell asleep. Waking up in the white space, he pushed open the door to the Fairy Tail World and arrived in the forest behind the guild.
"I'll wander around this World first to get to know it properly, and I'll come find you in a month."
Emerging from the box, Dumbledore did not intend to go with Goku to the guild to meet Master Makarov and immediately begin magic exchanges.
Instead, he decided to take some time to understand this World on his own first.
Goku was still too simple; apart from training, he didn't care about anything else, so he knew too little about this World.
Since he had come, he naturally had to look out for Goku to prevent him from suffering any losses in this World in the future.
As for the issue of language and writing, in his opinion, it wasn't a problem at all.
In this regard, he was quite confident in his own talent.
After all, in his own World, he had taught himself the languages and writing systems of over a hundred magical creatures, including merpeople, fairies, Trolls, and giants.
Therefore, in less than half a month, he should be able to learn the common language and writing of this World.