Actually, in Dumbledore's opinion, Hagrid's current strength was not weak.
Although his magic was only at a third-year level, because he had giant blood in him, his strength and magic resistance were very high.
The magic of ordinary Aurors and Black Wizards would not have much effect on Hagrid.
Even the Curse of Slaying, unless cast by a top Wizard like Snape, would not be able to achieve a fatal blow.
Although the Curse of Slaying was known as a one-hit fatal death curse, it also depended on the situation.
The power of the Curse of Slaying mainly came from the caster Wizard's own magic strength and the intensity of malice during casting.
Normally, with the body of an ordinary Wizard, being hit by a Black Wizard's Curse of Slaying would definitely be fatal.
Because his body simply could not resist the power of the Curse of Slaying.
But if it were a magical animal, it would be different.
Just like a fire dragon, it was impossible for any random Black Wizard to kill a fire dragon with one Curse of Slaying; if that were the case, fire dragons would not be so dangerous.
Gringotts would also not spend a lot of money to buy fire dragons to guard its vaults.
Because those who dared to steal from Gringotts were most likely Black Wizards, and Black Wizards basically all knew the Curse of Slaying.
If one Curse of Slaying could easily send a fire dragon to its end, what would be the point of a fire dragon guard?
Similarly, for Little Wizards in their first or second year at school, even if they learned the Curse of Slaying, hitting an adult Wizard would at most make the adult Wizard bleed from the nose.
Although Hagrid's magic resistance was not as good as a fire dragon's, an ordinary Black Wizard's Curse of Slaying really could not kill Hagrid.
So, Hagrid's strength was basically enough for him to fight seven or eight ordinary Black Wizards alone without any problem.
If he could learn to use ki, he would be even more formidable.
A Hagrid who learned ki would have his speed greatly increased, and most of the Wizard's spells would likely not hit him.
And once Hagrid got close, even Voldemort would probably get a good beating.
Most importantly, Hagrid was the Wizard he trusted most, and he would never betray him.
"Wukong, I want Hagrid to train with you starting tomorrow morning, is that okay?"
"Of course, it is."
Goku agreed without even thinking.
If Hagrid could train ki, he would be a good sparring partner, and they could practice fighting together.
Dumbledore couldn't do this, because Dumbledore's fighting style simply couldn't provide him with the desired combat training effect.
If it were magic combat, that would be another story.
"Today we are going to learn the basic Deformation Curse, which is a very profound subject. I will first teach you the basic incantations..."
After breakfast, Dumbledore began today's spell lesson.
Yesterday, he spent half a day teaching Goku most of the basic first-year spells, but he did not teach the Deformation Curse.
Because the Deformation Curse was different from most other spells.
Wizard's magic was mainly divided into two types: White magic and Black magic.
There were many, many White magic spells, and they were all categorized under the spell class. Black magic, on the other hand, could only be learned a little in the Defense Against the Black Arts class.
However, among White magic, there was one type of magic that was singled out to form its own course.
That was Transfiguration.
In other words, the effect and difficulty of Transfiguration could be compared to all other normal magic, as well as Black magic.
Transforming inanimate objects into other inanimate objects, inanimate objects into a living being, and a living being into an inanimate object.
Transfiguration already involved the essence of life and could be said to be the most complex and dangerous subject.
"I like Transfiguration!"
Hearing Dumbledore explain Transfiguration, Goku immediately became energetic.
This was the magic he was most interested in, besides Apparition.
Although Dumbledore had already told him that he couldn't conjure food out of thin air, being able to transform food was still excellent.
For example, if he hated eating bread and drinking coffee, he could use Transfiguration to turn the bread into roasted birds and the coffee into fruit juice.
"Fravidum!"
As noon approached, as Goku's finger glided through the air, the cup on Dumbledore's desk turned into a chamber pot.
"Very good. If the rhythm of the incantation was a little slower, the transformation effect would be even better."
Dumbledore picked up the chamber pot and examined it carefully, a satisfied expression on his face.
Goku was indeed very talented in learning spells. In just one morning, he had basically mastered the basic Deformation Curse.
And it wasn't just small transformations like turning a needle into a match; larger objects were also completely fine.
After lunch, Dumbledore began to teach Goku the basic theoretical magic of Transfiguration.
When mentioning Animagus in human Transfiguration, Goku suddenly raised his hand:
"Grandpa Dumbledore, can you explain Animagus Transfiguration in more detail?"
"Animagus Transfiguration, this is a very difficult Transfiguration magic. Even in the Wizarding World, very few people have mastered it."
Dumbledore saw that Goku was very interested, so he began to explain the knowledge about Animagus in advance.
"We just mentioned that Transfiguration can be cast on any non-magic item, and also on people, but not on oneself.
However, Animagus Transfiguration is an exception.
It allows oneself to transform into a non-magic creature while maintaining sanity, without being controlled by the creature's instincts.
However, becoming an Animagus is not that easy.
First, you need to continuously hold a single leaf of Mandrake in your mouth for an entire month (from full moon to full moon).
You must not swallow the leaf or take it out of your mouth at any time. If the leaf leaves your mouth, the entire process must start over.
Secondly..."
After listening to Dumbledore's explanation of Animagus, a thought suddenly surged in Goku's mind.
"If I use Animagus to transform into a giant ape, is it possible that I can control my sanity?"
"Wukong, why are you so interested in Animagus?"
Seeing Goku lost in thought, Dumbledore was a little curious. He felt that there might be something behind this.
Goku honestly stated his thoughts:
"I have a tail behind my butt, and on the night of the full moon, I transform into a giant ape and lose my sanity.
But in that state, my strength will increase by at least ten times.
So I thought, if I could become an Animagus, would I have a chance to fully control the giant ape state..."
"Strength increased tenfold!"
Hearing Goku's words, Dumbledore couldn't help but widen his eyes.
If he didn't know that Goku was innocent and wouldn't lie, he really wouldn't believe it.
Goku's current strength was already so terrifying; if it increased tenfold, how terrifying would that be?
A tenfold increase in strength was not as simple as going from being able to fight one person to fighting ten people.
Usually, a tenfold increase in strength meant that if one could originally fight one person, now no matter how many people there were, they would pose no threat.
In other words, people at his and Voldemort's level, when facing Goku, might be eliminated before they even cast a spell.