As soon as the door was moved, a jolt of pure, cold air touched my body and passed me by.

The fascinating view left my jaws dropped.

" It's the first time in my life, such beautiful sight came into my view! "

Around the walls of the big cave, various colored crystals of different sizes are glowing brightly and illuminating the room.

As soon as I entered the cave, my whole body began to overflow with energy.

There is a pond in the middle of the room.

"Why is the water so clear?"

I couldn't help but mumble seeing the fresh-looking water. 

Couldn't able to control my greed and ran towards the pond, but jumping in it wasn't an option.  

As my body was stinky and dirty, it would be a waste to dip my body there.

 

I drank till my guts filled. The taste is great and no odor or smell.

I looked around curiously and then approached brightening crystals.

Getting closer to one I touched the middle-size green crystal,

*ding*

[Mana crystals have been detected]

[You've found Wind Mana Crystal]

[Would you like to absorb mana ?]

'Ow....!'

'What benefit would I get by absorbing these crystal's mana?

[This mana will help you to gain an affinity for elements.]

"Cool.... Let's suck all of 'em out of the crystal"

The light was gushing out from the crystal and getting absorbed into my body swirling around.

* ding *

[Absorption completed. You can cast wind spells. Would you like to absorb the remaining mana crystals in the cave?]

It was quite shocking how easily I gained elemental magic!

"Suck everything you can!"

* ding *

....

...

....

....

A Series of notifications came while mana crystals were turning into light and getting sucked into my body.

Let's see my new skills.

"Fire Magic", "Water Magic" "Wind Magic" "Earth Magic"

Hey hey hey!

Ain't I able to cast all-elemental magic!!

What's with this place! 

[Would you like to store mana condescend water? ]

"With pleasure!"

In a blink of an eye, the pond's water was * popped *

Really, this is what I call a great system !!!

*ding*

[Natural Energy has been detected]

[Energy collection completed]

[Transferring Natural Energy to Nil Space]

[Nil Space construction set into action]

'Is there another element besides the fundamental elements? '

"Yo, what is 'Natural Energy?"

[Natural Energy - Pure form of energy that contains mana manipulation force and the core of all energy. The cave contains natural energy that's in its purest form, besides, it has dense and compressed mana that is enough to supply power to this cave for thousands of years.

Congratulations to the master. You've found the purest natural energy.

Now, the system can run spatial construction. ]

"Then, there's a whole lot of natural energy outside.

Why didn't you collect from there? "

[The outside environment has been polluted by mana corruption.

Which is caused by the Dark and Light Elements.

They start to engage in sparring the moment these elements come to contact with each other. 

The light element is an indication of positive energy, naturally antagonizing the dark element, which is an indication of negative energy. So, they have been colliding with each other since the primordial time. The nature energy started to get less pure because of the collision.

But you've found a secluded place that has never been in contact with the dark element, and you didn't use dark magic]

"And, how did I get dark magic that day?"

[There are two ways to learn dark magic.

First, inherent through birth.

Second, corrupting through dark magic.

Your body has acquired it from the previous owner.

The same goes for Light Magic except for the second condition.

A pure-hearted, sane, kind soul will have an affinity for light magic.

But in the maximum case, light magic was blessed by the Light Goddess of this world while a child is born.

So, it's rare to have a light-magic user in this world.

But there's a possibility in the future if the master wants light magic.]

"Like how?"

[........]

* sigh *

"Ignoring my question again! The next time, keep your explanation simple, I've had enough of this long and thorough explanation even though I asked for it, 'kay ?? "

[.....]

"And also, what is this Nil Space thing?

How does it work? "

[Nil space is a completely separate dimensional space of the system.

The master will be able to access it once it is ready.

You will be informed. ]

"Hahahaha, a really good thing to have you around me, I mean as my system...

Is it possible to enter there? Or living in?

[Affirmative]

"Hell yeah ...!

Damn, now I've had my hideout.

I wanted something like that when I saw this type of personal space in manga and novels!!

" Make it as soon as possible"

[As you command]

-

-

-

'I've sure emptied this whole cave!

Nothing left except useless stones and a pit on the ground.

I wonder how this place formed.

It doesn't matter anymore.

I noticed something faintly glowing with yellowish light.

It looks like a formation!

How did I know? Reading Isekai novels, and what will be found on the last floor of a dungeon with strange art is definitely a formation or something like that! only the brain-dead won't recognize this kind of thing.

I set myself in the middle of the formation, then the light went bright and the scenery changed.

Feeling slightly dizzy, I came out of the cave!

"* Suuuu haaaaa * 

fresh air after a long time ....! Oh...!!

this is not the cave entrance!

Where am I?

"<Open Map>"

It looks like I'm now middle of the forest.

'Nothing particular can be seen

"<Mana Sense>"

As I closed my eyes,

Me in the middle and surrounding the wilderness, an image formed inside my mind. Cool!!