"Nice name, darling. Now for your Personal Gu..."
Interrupting Rias, Natsu said, "There are some more things I want to know first, Rias."
"What is it, darling?"
"You told me that I can enter the next level if I grow strong enough. What is the next level?"
Shaking her head disappointedly, Rias looked sad.
"Even I don't know the answer to that question, darling."
"It's fine, don't feel so down."
Not being someone who was used to dealing with women who were depressed, or women in general, Natsu didn't know what to do instead of changing the topic.
"Do you... Know anything about how a Dungeon Master grows stronger?"
Brightening up instantly, Rias nodded her head so much that it caused her breasts to jiggle.
"A Dungeon Master grows strong by increasing the level of his Dungeon Master Class. And the way to increase the Dungeon Master Class, is by capturing more Dungeons."
Frowning a little at how this was pretty hard to achieve, since there was the possibility of never being able to capture another dungeon, Natsu gave it some serious thought.
"Is there no other way, Rias?"
Pausing for a few moments as if thinking hard, Rias suggested something with uncertainty.
"There is another method, darling. But... I don't know if it will really work."
Feeling curious, Natsu told Rias to tell him anyway.
"Other than growing stronger by using the Dungeon Master Class, you could enter a Dungeon which belongs to other Dungeon Masters and defeat the monsters inside them."
"However, since you are a Dungeon Master, unlike ordinary adventurers, you don't have a combat specific class which can help you defeat them."
"Also, if you ever take your Personal Guard which is meant to fight for you inside any Dungeon which you don't control, the Dungeon Master will receive a notification that you have entered."
Indeed, while this method was a surefire way of allowing Natsu to grow stronger. It was also possible for him to die as soon as he entered an enemy dungeon.
"Okay. Now tell me about the Personal Guard."
"A Personal Guard is something that every Dungeon Master is allowed to create, because most Dungeon Masters are very weak and can only depend on others to fight for them."
Raising an eyebrow at how Rias used the word 'most' unconsciously, Natsu realized a few clues about the other way to grow strong.
"But I have to warn you, darling. Please be careful when creating your Personal Guard, because every Dungeon Master can only create one Personal Guard for every Dungeon under their control."
"And once your Personal Guard dies, they can not be revived in any way."
"Also, if you conquer other dungeons, you can choose between retaining that dungeons Personal Guard and making it yours, or destroy it and make an entirely new one of your own."
Saying all of this, Rias asked, "Are you ready to create your Personal Guard, darling?"
As Natsu nodded his head, his kind began showing the same interface which appeared when he created Rias.
Deciding to test the limits of what was acceptable, Natsu didn't create anyone but started with the ability section, which would essentially dictate how strong they were.
He first tried out various professions ranging from swordsman, to universe destroyer until he found which abilities were acceptable.
Turns out, the Dungeon Masters were given a cheat like option, because while the interface didn't allow any ability which could be achieve anything from a snap of their finger.
It did allow abilities which were overpoweringly strong, as long as they were complicated to use, and depended on the user.
Therefore, Natsu began seriously thinking about all the female anime characters who were both strong and had an ability which couldn't be used by just anyone.
That's when it struck him.
Immediately imaging Erza Scarlet, Natsu entered her ability - Requip to see if it would work.
It did!
Once this happened, Natsu began imagining all types of weapons and armours that Erza possessed, because without them she wasn't as strong as he wanted her to be.
Luckily, the DH System worked wonders by looking through his thoughts and recreating every single one of the armours and items Erza ever used. Including those he couldn't even remember if he had ever seen.
As everything was accepted, Natsu realized that he used a loophole to create Erza, because the DH System most likely didn't recognize having multiple weapons as a strength.
Next, Natsu chose her personality to be cold and cruel to the others, and kind/warm towards only him.
After everything was finished, Natsu didn't change her appearance in the slightest and chose finish which started the process of creating her in front of his eyes.
Indeed there were many strong female characters that Natsu could choose. However given that he was being asked to choose a guard, compared to Yoruichi, Boa Hancock, and other strong and beautiful women, Natsu preferred Erza Scarlet.
After all, with her strength, power, and armours, not many would be able to defeat her.
Also... Erza not only had big breasts, but she even possessed so many cosplay costumes that Natsu would probably never get tired of.
As those sexy costumes entered Natsu's mind, he unconsciously began grinning.
It took a lot longer to create Erza, than it took to create Rias. Most likely due to the fact that the DH System had to give her the ability, and create all of her armours.
Once the complete Erza Scarlet appeared in front of him, Natsu looked at her and tried to assess her strength, when a notification window popped up.
[Name : Erza Scarlet
Class : Personal Guard (Lv1) (Ability : Requip)
Grade : SSS
Strength : 99
Mana : 99
Vitality : 99
Agility : 99]