After checking his status, Natsu finally started paying attention to his surroundings.
Originally everything was dark and all he could see were the lines of text in the air which despite glowing, did nothing to shine light on anything around them.
This allowed Natsu to understand that only he could see them, and they weren't physically present.
Luckily as Natsu hesitantly took a step forward the various torches which were fixed on the sides of the corridor which looked like a tunnel dug through a mountain began burning on their own.
At the same time, Natsu realized that he was standing in front of what could be considered as the entrance to the dungeon.
However, he couldn't see anything on the other side of the huge hole, almost as if nothing existed.
But, Natsu knew for sure that on the other side of it was the regular world outside the dungeon. And it must be something special which was keeping either side from seeing what was on the other side.
Nodding his head from thinking that his hypothesis was most likely correct, Natsu began walking deeper inside the dungeon.
The passage seemed endless, but it finally did come to an end.
Where the passage ended, a huge empty space was in front of Natsu who entered it without the slightest nervousness.
After entering the huge circle of empty space which had both a wider area than the corridor and a higher ceiling, Natsu didn't take long to find a glowing black cube shrouded in mist at the centre of the cave.
Stepping near it, Natsu extended his hand towards what was most likely the dungeon's core.
As his hand kept on nearing Natsu didn't feel anything special, and only sensed a change when his fingers finally touched the floating cube.
[Checking credentials... ]
[Dungeon Core is being activated.... ]
[Choose a name and form for your Dungeon Core.]
[Once chosen, neither of them can ever be changed.]
Along with the various floating messages, Natsu's brain knew what to do.
He was given the chance to design how his dungeon core would look, and give her any name of his choice. However, it seemed like he couldn't give them any special abilities or powers.
Feeling disappointed for a while, Natsu began designing the ideal image he felt would suit his dungeon core.
A sexy and mature, but kind big breasted woman.
With that idea in his mind, Natsu didn't hesitate to use the various female anime characters he had ever seen as an inspiration.
And in the end, he chose to make his dungeon core look like Rias Gremory, from Highschool Dxd.
Once the idea and the image entered his mind, it was like Natsu could see her body in front of him, and use his hands like a computer mouse to turn her body and view it from all angles.
At the same time, he could also make any changes he wanted to.
The first thought Natsu had was to make her boobs bigger, but he rejected such thoughts since he was afraid of spoiling her beautiful body.
Therefore, he decided to just make Rias look more mature and give her a kind personality.
Luckily, the DH System understood his thoughts and turned Rias's face and body into that of a more mature one, sparing him the trouble of racking his brain and trying to imagine how a fully matured Rias would look.
Within seconds the image of Rias Gremory in his head turned into that of a more mature one which gave off that caring housewife vibe he was looking for.
Immediately Natsu conveyed his thoughts to the DH System that this was what he wanted his dungeon core to look like.
[Dungeon Core's form has been decided.]
[Choose a name for your Dungeon Core.]
Not hesitating much, Natsu decided to go with the name Rias Gremory.
"Rias Gremory."
[Dungeon Core's name has been set as Rias Gremory.]
Before Natsu who was seeing the black cube turn into the form he had chosen, the DH System sent him a warning.
[If the dungeon, which has been set as the main dungeon is destroyed, or conquered, your dungeon core, Rias Gremory will be destroyed and can never be brought back in any way.]
Just this sentence was enough to fill Natsu with enough determination to aim for the top, and not let anything happen to his sweet Rias who had now completely formed.
Similar to the image in his mind, after forming, Rias truly looked similar without the change of a single hair!
She had the same huge breasts, same breathtaking red hair, the same vibe he loved, and most importantly she was dressed in the same red and black coloured traditional Japanese kimono he imagined.
As soon as she formed, Rias opened her eyes and upon spotting Natsu, she bowed deeply and called him, "Master."
Feeling emotional towards his dream which turned into a reality, Natsu said, "Call me darling."
Since that was what her master ordered, Rias followed his words.
"Darling"
"Once more."
"Darling?"
"Once more."
Unable to feel that he would ever be satisfied with it, Natsu told Rias to call him once more, but something unexpected happened.
Rias's face which had started blushing since the second time she called him darling, turned completely red.
"Darli.... Humph! You're teasing me! I won't call you that anymore!"
Listening to how chiding and embarrassed Rias's words sounded, Natsu was completely stunned and couldn't react for a while.
Soon after recovering his senses, Natsu saw Rias shyly looking at the floor and rubbing it with her toe.
Seeing this Natsu guessed that either the artificial intelligence capabilities granted by DH System to the physical body it created were out of this world.
Or, she was a completely sentient being who could think for herself, and act on her own.
After a few more tests, Natsu came to the conclusion that the Rias who was currently giving him a lap pillow with legs which were nervously trembling, was a sentient being!