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Gustav's powerful breath Attack managed to finally overpower and defeat the Infernal General of Might, as it continued its course, impacting the red tower within it!

CLAAAAASSSSHH!

"Nnnggh?! W-What!"

The entity within the tower was surprised, how could it be possible for Gustav to be able to actually damage the tower? It had begun to show cracks on it, as demonic and infernal energies began to frantically pour of it, the entire dungeon-like magical structure was being consumed!

Gustav didn't stopped, channeling the power of his summons through his Mana Connection with them, he began to pour even more power into his breath attack, breaking through the tower's magical defenses one by one!

CLASH!

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"No…!"

CRASH!

"Wait… Hold up!"

BOOOOOOMMM!!!

"Gyyyaaaaggh…!"

The entity looked like the entire tower that it inhabited began to break apart into pieces! It looked down into the portal that it connected the tower to the World of Demons, the portal quickly closed itself, leaving it trapped in this tower falling apart!

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"You damn human!!!"

The entity within the tower cried in anger, as the entire structure fell over it!. BOOOOOMMM!!!A tremor resonated through the entire area around the tower. The demons pouring out of it were also crushed to death!

CRAAAAASSHH…!

Gustav quickly spoke to Gaia.

"Gaia, is this enough? Has the tower ceased working properly?" he asked.

"It has! It stopped working… the portal that led to the Demon World was also broken… Outstanding work, Gustav!" Gaia praised Gustav, as he looked over the tower, it emanated a strong presence… the being within it had yet to die even after being crushed by the entire building falling apart.magic

Gustav flew towards it, charging more of his power.

"I will finish it right away!"

He roared on his dragon form, leaping into the fallen apart tower, only to find… a small hand coming out of it, then another, as a demon girl came out!

A demon girl who was quite not so intimidating.

Her skin was bright red, she had two small black horns, a red jewel in the middle of her forehead, and long black hair, with shiny golden eyes. She wore a black dress that revealed her slim legs, and black sandals.

However, Gustav didn't really care about her appearance, he knew she was a strong, and an enemy, and therefore, he was going to kill her.

"W-WAAAIT! I SURRENDER!"

However, against this expectations of an epic battle where she would resist and fight against him angrily… she surrendered!

Gustav was thrown out of his own vibe, feeling a bit strange.

"Excuse me? You surrender?!" asked Gustav. His dragon form opened its jaws wide open; it was ready to blast her with a powerful breath attack.

"Yeah! You're way too ridiculously strong! Do you think I am dumb enough to fight against you and die? I can't even escape back; you broke the portal!" she complained, as if Gustav had done something terrible and sinful.

"So what? You were invading my planet. It was the natural thing to do to protect it with what I had. Wouldn't you also fight back if some strangers came to your world and began massacring all life to conquer it?!" asked Gustav.

The girl suddenly got silent. Gustav had a point…

"R-Right… I suppose… You are in the right there… T-That's why I surrender!" she said. She was very child-like, just like her appearance gave it out. She even was very flat for a demoness of her age.Gustav didn't knew what to do.

"Should I kill her anyways for EXP?" he wondered.

"Gustav, it would be better to catch her as a prisoner, she could give us a lot of valuable info about her world! She also seems strong. If there can be a way to make her trustful, she would be a good ally." Said Gaia.

"Hmm… Fine. Although Kireina and her twins were already looking her with the intent of eating her… It will be a tad bit hard to talk them out of it." Sighed Gustav.

"R-Right… Perhaps… Do your best." Said Gaia.

"Fine, you can come, but first, we'll do a little thing." Said Gustav, as he infused his soul into the demoness' body, she was surprised, but let him have his way.

He began to make something quite rough, but he effectively used his Mana and soul to create a soul contract, binding the girl's soul to his and then overpowering her in the contract due to her willingness to surrender.

Due to this, she instantly became his servant, and felt an instinctual and strange desire to kneel.

"It worked properly… I seem to have become proficient at magic and other things without even using Skills too." Said Gustav.

"Ah… W-What happened? What did you do to me, m-my lord? Ah! Why did I called you like that, my lord? Uwah! Again? My lord! What is going on?!" she cried.

"I've forced into you a contract. Now you're below my authority and won't betray me as easily…" said Gustav.

"Now, let's clean this mess and go back home, I want to take a nap…" sighed Gustav. He was quite exhausted, after using so much mana and assessing the entire army of summons, he felt like falling unconscious at any moment! He really wanted a break, for fuck's sake.

The army quickly picked up everything they found and saved it inside his inventory, as he grabbed the demon girl with his giant dragon hand and brought her inside his Divine Realm/Inner World.

FLASH!

The girl found the immense internal world within Gustav's soul as incredible.

"Y-You have this inside your soul, my lord?!" she asked.

"Indeed, now, tell me what the heck you are." Said Gustav, as he turned back into a human and interrogated the demon right away over an empty grassland. Kireina, Katrina, and Katarina looked at her from all sides too, intimidatingly.

"Speak, little girl~"

"Don't worry, as long as you speak there won't be any beatings."

"We swear…"

"E-Eheee?!"

The demon was a bit scared…

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