The dimensional door that Admir used, is a part of Creation skill which gods created to fulfill one's wish to enter the world they wished to be at...
But in order for you to use the dimensional door, you should have a tremendous amount of mana; and the mana that dimensional door consumes depends on the world that an individual wishes to enter.
For Admir's case, he wished to enter the room He and Mephisto wished and created, "The Dungeon of the Doom."
The Dungeon of The Doom is wished and created by Mephisto and Admir while they are still High-Holy Knights, they found an artifact that they accidentally dropped at the basement and the artifact entered at corner of the basement and is stuck their forever.
The Dungeon of The Doom is a dungeon full of traps and monsters, but there is a secret passage only Admir and Mephisto knows, and if you reach the end of the traps, there will be a library relies.
Because of how small "The Dungeon of the Doom" is, he only needed 1/3 of his own mana to go in and out.
***
'Greetings traveller, you have entered the world named Earth.'
'What the fuck!? What's this? I've never seen this before! Can I touch it? What the hell! I can touch it!'
Rowan used the skill ???'s Creation, while he was entering the dimensional door unknowingly. Two of his dreams happened, first one is to enter "The City of Light", second, "To have a helper to organize his skills".
But Rowan didn't know what the catch was and unknowingly used the skill ???'s Creation. ???'s Creation is the skill that enables the owner's dream to come true, but there's a catch, if you use this skill, you will lose all your strength and mana.
In short, Rowan lost his Tremendous strength and Infinite Mana.
-What the... I can feel my strength and my mana disappearing! What's going on!
'(Red) System: You have lost your physical strength and mana because you used the skill ???'s Creation.
???'s Creation Skill Description: a skill that only the highest type of dragons or gods only has, if the skill is used by a sealed dragon, sealed god or a mortal, they will lose their power in order for them to achieve their desired creation. This skill can create 'anything' the holder of skill desired.'
'Wha..! ???'s Creation? I didn't use this skill! I didn't even activate it! What the fuck is going on? And why is this boxy thingy has this type of description?!'
System: Initiating, organizing skill and the owner's description.
Organizing of skills completed, please insert your name.
'What's this?! Why is it asking me of my name?! And what's this "Orginize-'
'Wait... don't tell me! The dream of mine to have my skills organized and to see my current strength, mana, and progress came true!?'
'Alright I'll insert my name...'
"Rowan"
'Owner's Description recorded. Rowan (Level 1) Rowan's Stats:
Strength 149
Mana 85,
Intelligence ???
Dexterity ???
Agility 151
Stamina ???
Organized Skills List: ???'s Appraisal (?), ???'s Body Swap Teleportation (?), ???'s Creation (EX+), ???'s Shadow Devourer (?), ???'s System(Created by ???'s Creation), ???'s Skill Absorption (?), ???'s Insane Growth (?), ???'s Dragon's Vision (?), Sword Mastery (S),....'
'What the hell!? This ridiculous skills of mine!? How many are there?! What the fuck, I can't count them! There's too many of them!'
'And what's wrong with these "Rowan's Stats"? Wait, is it my progress? My stats!? Seriously! This is actually ridiculous! But wait, what's with these "???", It's the same as my skills, ???. God, what's wrong with this world?!'
'This planet is called Earth, 7 continents and 195+ Countries, this world has no magic, mana or any thing about the world "Avalon" has. You have travelled into a different world.'
'Earth? So this is the name of "The City of Light"? Come to think of it.. This place is huge, the buildings are well built and each buildings has a light inside!'
'NOTICE: This planet is full of magical energy, you can absorb this world's magical energy and turn it into your stats.'
'So how am I able to absorb this world's magical energy?'
'In order for you to absorb this world's magical energy, you must at least have stats of 650 strength and 1025 mana.'
'What..! So I have to get my stats up before I absorb this world's magical energy!?'
Rowan hold his head with his hands and shaking it out of annoyance.
'But how am I able to level up?'
'To level up, you must complete a task to help this world advance, do daily chores, or to take a job in this world: being a military is the one that gives the highest level points. If you level up, you will have 3 points, but because of ???'s Insane Growth skill, you will receieve 15 points every time you level up..'
'Oh, really? Then it would be esay! But what is a military?'
'Military are the people responsible for protecting a Country, they're also known as soldiers.'
'Oh, so Planet Earth also has soldiers huh? Pretty interesting. Well then, let's become a military!'
Little did Rowan know, it wasn't an easy task, he was forced to work hard and didn't had the chance to level up, before he became an official military it took him 3 weeks, and only leveled up 3 times.
Rowan became a military for a year. He then forgot that he needs to come back to his world. Rowan was trapped on Earth for 1 year, fortunately time their works 50x slower than Avalon's.
Then at one time, he remembered that he needs to return to his world because it has been a year.
Rowan leveled up to 51 after staying at earth for a year, leveling up was harder than he thought.
***
After Rowan disappeared into the world of Avalon, Kenta looked for him all over the house, and wondering where he went.
He then remembers that Rowan might be at the basement, inspecting his explosives...
'Where the hell did Rowan go?'
'Ahh, he might be in the basement inspecting the explosives..'
Kenta then checked for Rowan, but he didn't find Rowan but a pile of explosives all over the place and a corner that's clean, and he thought that it was kind of off, but he left it off and continued to find Rowan..
After hours of searching for Rowan, Kenta didn't find Rowan, so he thought that Rowan probably got out at the evening..
***
After Garen and Elara gathered the troops and 7 Holy Knights (Holy Knights are under High-Holy Knight). Both of them then informed King Rigurd that they're ready.
Confused and Worried Garen asked, are they attacking a kingdom or a strong group of people? He was confused because they prepared 50000 soldiers just for this attack.
"Your Highness, though it would be rude to ask this, but why are we bringing too many troops? Are we perhaps going to invade our neighbouring kingdom?"
'Why is King Rigurd preparing too much? And why is he ordering Elara to put 15 C-Rank light magic defenses around him?'
'I never once saw King Rigurd this cautious before.'
"We are attacking The One-Man Army."
Garen was confused and didn't know who is the person Rigurd was referring to, he was also confused on why is Rigurd preparing too much and being too cautious just to attack one man.
Unlike Garen, Elara was shocked to hear the title "The One-Man Army", she knew who that person was because she saw that man when she was 5 years old and approached "The One-Man Army" and asked who his name was.
While Admir was sitting at a bench looking at the sunset, little Elara approached him and asked.
"Uh... Mr. Hero? What's your name?"
"Oh, hey there little miss! I'm The One-Man Army!"
Little Elara looked at Admir's smile with her eyes sparkling and shining.
[End of Flashback]
'The One-Man Army..?'
Elara was stunned questiong while she opened her eyes wide out of shocking news.
"I'm sorry, did I heared that right Your Highness? The One-Man Army?"
"Oh? So you know that guy is, huh? Yes, you heared it right, I am going to eliminate him this evening."
Rigurd muttered these words while smiling sinisterly.
"But Your Highness..!"
"If you don't want to be involved with The One-Man Army, you can stay here."
"Are you sure Your Highness?"
"Yes, you can stay here, I will respect your decision."
Rigurd was enraged by Elara's decision and his eyes narrowed.