In this universe, there exist special places that are bounded by walls that you cannot transgress, meaning you cannot enter those places by physically travelling there.
Filled with Energy of Death, an eerie form of mana, the Netherrealm stores people who have died but didn't pass on.
It's altogether different from the situation of the white dimension in a way that what manifests in the white dimension is not a real man or woman but their deep strong desires that were left unfulfilled.
Think of it as a place where all kinds of negativity lingers and combining together, it forms a mindless creature that crawls there.
That was the foundation of that place before it started evolving with the system, too. Those creatures I mean.
With evolution, some of those negative desires ended up gaining back their original memories, or perhaps a fraction of it, which increased their innate desire to come back to this planet or perhaps to where they belonged.
Those desires, though, the netherrealm doesn't allow them to come back here, it allows them to rebirth or perhaps transfer a part of them into Planet Vermilion which later forms the foundation of monsters in planet Vermillion.
Yup, in a way, monsters are nothing but the very lingering desires of those who have passed on. Stronger desires form stronger monsters…
A distinct proof of it was the King of Basilisks, who killed his murderer in front of the world while recalling everything that man did to him and his family. Kind of made people think who the real monster was, the man or the Basilisk?
In any case, Netherrealm is the place where it all starts and normally you cannot enter it, but there are special ways to go there.
One of them is to use a special sacrificial move to permanently move there, though I would not recommend it, unless you are my enemy or something.
The other is to use the portals which, though rare, aren't as rare as people seem to think.
Those monsters, outside the Netherrealm, who have been trying every way of opening a gate to the Netherrealm, have specially created this device to travel around the world for many reasons (getting back their power from Netherrealm and stuff).
This device, though rare right now, will become extremely famous later after the second Cataclysm. The main reason for it being famous is that the normal power level of an individual at that time is much more than those at Netherrealm monsters can handle.
And the fact that Death Energy lingered there for as long as we can think of, various rare metals and weapons have too been formed there.
Though it wasn't that easy to take it all at that time because there existed some monsters who didn't choose rebirth and lingered there, getting more and more stronger, in the end creating their own kingdom.
And it was this fact that made people from planet Vermillion hesitate to completely comb through the Netherrealm. Even when I died in the last timeline, I haven't heard of the Netherrealm being completely explored.
But right now, way before the first Cataclysm, I don't think anyone has the capability to enter that place and survive even for a second because even the weakest monsters are S-Grade and they always travel in groups with each group containing about 1000s of them.
Wouldn't wanna mess with a thousand S-Grade monsters at once, now would you?
To open the portal, it requires two types of energies, or perhaps three sometimes. One is normal mana, the other is Death Energy. The final energy which can replace normal mana is Lunar Energy, though the amount of Death Energy required would be almost 3 times more with at least some normal mana in it.
Strictly speaking, one may need at least an A-Grade human's complete mana sucked to fill 10% of the normal mana required, though a single B-Grade Luna can completely fill it without much of an effort.
As for Death Energy, it should be fine as long as you kill some monsters and then use their energy to charge it. The portal artefact had the property to actively absorb Death Energy from the surroundings.
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However, you may require about a dozen of S-Grade monsters to actually open it once, which means you will need about 2-3 dozen times the dark energy of an average A-Rank human's mana in your bank if you want to have a return trip from Netherrealm.
Which is another reason it isn't really feasible for one to actually open this portal at this stage of power. If one mistakenly opens the Netherrealm portal, the entire Planet Vermilion will end up dying even before the parasite can attack…. But the chances of that are less or perhaps none as of now.
Because… Well, it takes about a week's time to open the portal with a huge amount of radiation of sorts produced to alert the world about its existence. People also get a system notification and a mission to close the portal before the time is up in exchange for a huge record.
How do I know this? Well… I was one of those idiots who actually opened the portal once and entered it in search of power. I mean, I was really crazy back then and lack of rationality made me do it… well whatever, I got something powerful so I guess it was worth it…
Even if I had to kill about 10,000 people to make sure the portal opens smoothly. Which I later closed as soon as I entered the Netherrealm.
It took me sometime to return to Planet Vermilion and by the time I returned people had… kind of forgotten about me and what I did because the war among the species had reached quite a high intensity, along with the given factor of the SSS-Grade monsters taking charges, finally getting out of their dens and nests.
What happened inside the Netherrealm is a story for another time. For now, the main question is, what will I do with this portal? Hmmmm… All I can do is open my mana channels and reach the SS-Level without relying on Blood Magic and Spirit Magic. Once I can do that, I will enter that place to take back what is rightfully mine.
For now… let's wait.