After Yao got the message from the system.
She immediately went to Luci who was fixing himself some food.
He craved a lot of junk food so he ordered so many pizzas and hamburgers.
He was eating when suddenly an orange portal appeared before him and a bald-head woman with a yellow robe came through.
[Tada! Luci-sama, Ceil has found a good teacher for Luci-sama. She is very good at close quarters combat and knows how to use a lot of weaponry!]
"Oh, thank you. You sure work fast, Ciel"
Luci could feel that Ceil was very happy when he praised her.
Yao looked at all the food on the table and shook her head.
She understood him. After all, in the world of Attack On Titan. He couldn't have good food like in the modern world.
Craving these foods was normal.
"I will take you in as my disciple but in one condition."
"What is it?"
"You have to do everything I said without question."
Luci looked at her and saw that her color was pure green.
This meant that she was really a good person.
However, he felt that something wasn't right.
"I am sorry but. No, I will not do anything you said without questioning you first. What if you told me to do weird things?"
Yao smirked at him and he knew right away that she was testing him.
"You are good. I will take you in as my disciple. You can ask as many questions as you want. How about it?"
Luci thought about it a little bit. He didn't know if it was a good idea to take her as his master or not.
"Can you show me something interesting? And I will think about accepting you as my master."
"How cheeky but I don't dislike it."
Yao then created a mirror dimension and it make Luci threw up everything he just ate.
"How dirty. You should not eat more than your stomach can hold."
"Alright! Alright! Stop this damn thing! I will accept you as my master!"
Luci felt a headache and told her to stop. He accepted her as his master already.
"That's not hard. You must learn to control your innate power. The mirror dimension will be nothing but a joke to you."
Luci shook his head. He hoped that what she said was true.
"I will come to get you tomorrow. You will have to go to Kamar-Taj with me."
"Kamar-Taj? Do you mean in Kathmandu, Nepal?"
"Yes, and you don't have to worry about anything. We have the internet there. You can bring a game console with you to play when you are bored."
Seeing her expression. Luci knew that even if he brought it with him. She would not let him play and just train him as much as she could.
One week passed by quickly after Luci accepted Yao as his master.
And shit, it was very hard! Luci wondered if where he was at was not Kamar-Taj but Sparta instead.
Jotunheim, the coldest place in the realm.
Luci was looking around in the snowy field. He was shaking uncontrollably.
This was the first time he felt this cold in his life.
"Are you really going to do this to me, Master? Everest is not enough for you?"
It has been a week since he was taught CQC and how to use weaponry.
Yao even added mystic arts in the course as well.
"Yes, I have to check if your regeneration ability will work or not when you are in an extreme cold temperature. I think it works just fine."
Yao conjured a pair of swords before she attacked Luci. She was swift and precise.
Luci also conjured a pair of swords before he faced Yao head on.
Both of them exchanged blow after blow. The snow around them got blown away by the impact.
Even with titan strength. Yao was a lot stronger and faster. However, she controlled herself to be on the same level as him.
"You learned everything I taught you so fast. Don't you think it's unfair to everyone else?"
"Nope, why should I care about the other opinions?"
"Good answer, before you become powerful. Your mind must be strengthened first. You have done well with that mind of yours."
Yao suddenly used mystic arts, the mirror dimension.
Everything around them began to twist and distorted.
Luci felt a headache every time he saw the mirror dimension.
"Urgh… I hate this mystic art."
Luci's eyes turned white before he stomped the ground. The mirror dimension then broke into pieces.
"You really inherited Lilith's blood. You can destroy a fault dimension easily."
Yao stopped using the mirror dimension because it was useless against someone who could transverse around the omniverse.
Any space and time ability didn't work on him as he was outside the law.
"Now it's my turn!"
Luci let go of his swords and let it float around him. He then began to conjure more swords.
He stopped around a hundred swords because more than this and he would lose control of them.
Yao smirked and she did the same with at least a thousand swords.
"How cute."
"Urgh, I hate you master."
Luci lost again. This was the hundredth time already but he still held on.
Losing but improving was a good notion for becoming stronger in both body and mind.
"Well, I will give you some time off. I can't force everything to you more than this or everything you have learned so far would be wasted."
"I–I need that. I will go and have fun."
"Please do but you will come back after a week. You have three weeks left before your next mission."
"Yes."
Yao explained to him that he knew his mother and it was his mother who gave her a chance to rest.
She took him in as her direct disciple because she wanted to repay her.