Once upon a time a god created a universe, as gods are wont to do. The god created fauna and flora and added mana to the world. Not everything got mana - in fact most things didn't - but what did, excelled.

The god made some of the creatures sapient, and - while none of these had mana - they excelled as well. The sapient species excelled so well that they quickly claimed the top of the food chain.

Each time the god created new life they used up a bit of their power. As a god they had a lot of power, of course, and they saw no reason not to use it. A god had to have a world, and good worlds contained life.

For a while the god was satisfied with the world and its eight sapient species. But seven of the sapient species slowly grew bored of their luxurious life as a top predator and began to grow greedy for more. To not just be among the best, but the best instead. And as the sapient species had placed themselves firmly on the top of the food chain, the only way to gain more dominance was to dominate another sapient species.

Six sapient species turned to the eighth species - the only species that didn't desire to dominate others simply for the sake of it - and began to kill and capture any they found. A couple of centuries later, only seven sapient species remained.

The seventh species wanted more dominance as well, but found it easier to pick on a race rather than an entire species. The seventh species had seven races and one disliked fights and conflicts more than the others, which made it an easy target for bullying and abuse. After half a millenia, only six races remained.

The god had watched it happen but gave their creations the benefit of a doubt, hoping they would learn their lesson and cease to fight on their own accord. But when the remaining sapients simply went to look for someone else to dominate after they had caused an entire species and an entire race to go extinct, the god had had enough.

The god wanted to punish the greedy and power hungry - as those types had led the fights against the extinct species and race - but spare the helpful and kind. Not everyone had participated in the slaughter, but few had tried to stop it. And rarely had an attempt ended well.

So, the god decided to create Dungeon Cores, giving them the mission of luring the greedy into their dangerous depths with promises of riches. That their creations had free will was important to the god yet they knew that powerful entities, such as Dungeon Cores, needed restraints, lest they grow to become as power hungry as so many sapients had.

Thus Dungeons could only be accessed through a Portal and would exist in their own pocket dimension. Only sapients would be allowed to enter Dungeons as their creation had been because of sapients.

The the sapients would find useful and powerful items by killing the creatures of a Dungeon but with that danger naturally came the risk of getting killed themselves. This would tempt the greedy to go deeper in a Dungeon than their power would allow them, while the less greedy would escape unscathed.

The god declared that even though the Dungeons had been given a divine Mission to kill evil sapients they too would be given free will and a soul. And with free will came the potential for evil acts.

Dungeons were their own dimension, the ground and the walls itself, as well as all the creatures, puzzles, and traps meant to challenge and kill sapients. As such, they had been created immortal and would never die of old age. Yet with the potential for evil acts there needed to be a way for the sapients to destroy a Dungeon.

Which is why the god gave every Dungeon a Core.

A Dungeon's Core was their heart and mind where their walls and creatures were their body. A Dungeon Core would alway be aware of everything happening in their Dungeon as the entire was them. But should a Dungeon Core be destroyed or removed from their Dungeon the whole pocket dimension would collapse, forcing any sapients inside back out to the Surface World in the process.

This precaution unfortunately proved itself necessary.

Many times over.

Having created Dungeons, the god gave sapients the ability to earn Skills, Achievements, and Abilities. They could now earn experience by leveling up their Skills or - as an incentive to the violent and power hungry to enter Dungeons - killing creatures in Dungeons. When one had enough experience they would level up and gain two points to their six main Ability Scores.

Why six? The god gave each of the six sapient species, which had turned against the eighth, a natural affinity with one of the main Ability Scores. They did the same to the six remaining races of the seventh sapient species.

The sixth Ability Score was then made to represent the fallen species and race and to help prevent their fate from befalling on another. The god didn’t want the sapients of their world to make their every action based on their creator’s wishes - the god would have descended to The Surface World if that had been their desire - and so the god made the seventh Ability Score a hidden one.

Not that the Ability Score was truly hidden. It simply meant sapients wouldn’t automatically be informed when their Score changed, like they were with the other Ability Scores. Yet the right Skill or Ability could still inform a sapient of what they wanted to know.

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When the god created the system for the sapients, the creatures it had granted mana to, got access to it as well, but in a different form for each species. Some species could no longer truly die of old age, some granted massive strength or a special power. Several now earned experience simply for being alive while having mana flowing through their blood. But where sapients could gain many Skills over their lifespan, semi-sapients were instead born with one or more Skills with few ever gaining additional Skills.

And just like sapients, all semi-sapients could enter Dungeons where no mere animal could.

The god decided to keep this aspect, despite it having been unintentional. As these species had gotten a part of the system designed for sapients, the god named them semi-sapients.

However, the god still wanted the world to have some magical creatures that couldn't level up, and so gave a small amount of mana to several mundane species.

No other beings, other than those who could level up, had any reason to enter a Dungeon, so the god forever barred them entry.

In the beginning, this system worked as intended. Greedy, violent, and power hungry sapients entered a Dungeon and few of them came out alive.

Partly because of blood thirsty Dungeon Cores who killed to grow, rather than to rid the world of evil.

But as the good, kind, and helpful sapients had little reason to enter Dungeons, they rarely did. This meant that the sapients which exited a Dungeon, could much more easily dominate others with the newfound power and riches the Dungeon Core had given them. Good sapients still got experience from leveling up their Skills, but rarely could they compare to a dedicated Dungeon miner in a one on one fight. The good sapients tried to help others against these powerhouses, but found themselves outnumbered. After all, some power hungry sapients were cowards and, despite not daring to mine Dungeons themselves, had no problems gaining positions of power by supporting the powerful Dungeon miners.

To fix this problem, the god created tier ups and Breakthrough Orbs. This way, all sapients had a reason to enter a Dungeon several times in their life, while still making it more likely for the greedy, violent and power hungry to overreach their quest for power, diving too deep into a Dungeon and getting killed as a result.

The god then reset everyone's levels to once again level the playing field and thought the problem was fixed. But the good, kind and helpful sought no power and thus few of them had reason to want to tier up at all. Leaving them powerless once more against any wandering Dungeon miner.

To create more initiative, the god created Classes to come with a tier up and Skills to suit these Classes. Some Classes would be geared toward a peaceful lifestyle while others more suited for an adventurous one.

The changes worked and good, kind and helpful sapients started gaining strength to defend themselves against the dwindling mass of greedy, violent and power hungry sapients.

With the changes to the sapient system it also changed for semi-sapients. The semi-sapients adapted well to the tier up part of the update but could not gain Classes due to their lack of sapience. The god decided to instead let semi-sapient gain a suitable Skill with their tier up, as they had less of those than sapients did.

At this point the god felt bad for all the creatures that weren't included in the system they had made. These creatures couldn't gain levels or Skills or Achievements or Abilities. The god wanted to include them in the system but found that their previously abundant amount of power had diminished too much for such an undertaking. Instead the god gave all species outside the system the six main Ability Scores as hidden Ability Scores and gave them a chance to sacrifice part of an Ability Score in exchange for an innate Skill. They still didn’t have levels nor did they get any Skills except for the innate ones.

The god looked upon what they had made, and while the world was not perfect, the god still loved it.

One such imperfect thing was the Dungeon Cores. For despite their Mission to rid the world of evil they either mindlessly sought to kill all that entered their Dungeons, whether they be good or bad, or they refused to kill at all, instead falling dormant and doing nothing in order not to harm people. The god tried to remedy this by giving Dungeon Cores their own system with Achievements and Abilities suited to them. They linked the tier up of Cores to the number of bad sapients they had killed, hoping this would make the Dungeon Cores start to focus on their mission.

The god even allowed Dungeon Cores to see their Personal Status without having a Skill or Ability to allow them to do so and to ask the system for general information, neither of which the sapient version of the System allowed. Sapients had parents to turn to for general information, where Dungeon Cores couldn’t even leave their dimension.

Sapients could only see their own Personal Status the day they became an adult, unless they got a Skill or Ability to let them see it again. Letting every sapient see their Personal Status at any time would be too draining for the god. Instead sapients would be informed of what Ability Scores had been raised each level up, so they could keep track of it if they wished. Whether or not a sapient knew their own Strength Score wouldn't change what it was, after all.

And while this helped for a while, the Dungeon Cores all eventually decided to either kill mindlessly in search of growth as they had done beforehand or stop growing at all to preserve life.

Finally, the god had enough and stripped Dungeon Cores of their souls and free will. They would not be sapient or even semi-sapient and instead have no thought, no concept of right or wrong or their mission in life.

Only instincts and algorithms would remain.

The god wasn't satisfied with this, but had been drained of all but the dregs of their power after all changes and needed to rest to regain their strength.

And when gods need rest, it takes millenia for them to truly recover.

Besides, with all their adjustments it was mostly the greedy, violent and power hungry sapients who died in Dungeons anyway. Surely, the god could rest a while.

And so the god slumbered, not truly asleep, but instead becoming less aware of what happened in their world.

And thus, less able to act on anything.

Though now lower in number, the greedy, violent and power hungry sapients never truly ceased to exist. They came up with new ways for getting their way and with the god now resting and thus less aware, they often got away with it too.

One thing the god did notice, was when a soul, they hadn't created themselves, fused with a brand new Dungeon Core. With a brief scan of the unknown soul, the god saw that it was good and gave the new Core and its reincarnated soul what blessings the weakened, resting god could.