When System 0 was created, it was given the chance to create other systems that it sees fit, but the new systems under System 0's control can't be created unless Nature, Earth and ancestors accept them for their warrior's safety.
There are total of five systems and System 0 is one of them and at the top of all.
The other four systems connected to different stuff that are related to warrior's stats and future as their mankind saviors, starting with the system Warrior 01 tried but failed to pass, Training System.
Training System is one of the harshest two systems out there, though there aren't many but this one system is the hell of every warrior.
There are many levels in Training System that warriors need to go through to could level up faster, but the penalties are all the same, if you fail, you'll die.
A harsh one but it's required so warriors can release their full abilities since the system knows exactly who their enemies are and how terrifying they are, that's why it's trying its best.
But after it got information about their enemies stats, it decided to increase the difficulty starting from level 1 but that effected the warriors badly that some lost their lives, making things harder for System 0 to find substitutes.
.
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The second system after Training System is Virtual System, it might seem similar to the first one but the latter depends on fighting enemies more than fighting others under the same ancestor.
Virtual System used to be the connection link between the warriors and realms that'd lead to different nests of different breeds in different planets and worlds, but later on after the war ended, the system started losing mana but System 0 didn't allow it to die so it became the guide of all warriors. Whenever a team goes in raids to already opened realms, Virtual System would send data to that team so they can know what exactly they're heading into.
Luckily that system saved many teams in their raids, so as long as it's alive no teams will have troubles in their hunts in random realms.
The third system and the most favorite for those who'd barely survive Training System, Leveling up System.
This system guides its warriors easily from one to one hundred easily, it takes them by hand and help them take slow steps to their way to become better warriors.
The only disadvantage for this system, that it doesn't prepare them to fight real monsters and beasts, it only helps them with their leveling up and how to use their abilities, that's all, no deeper explanations or direct fighting one on one as Training System.
Some would say it's confusing to have this many systems but each warrior prefers a specific method of becoming better, and System 0 didn't want to let them down. After all, they're the heroes of their planet and dimension.
What they all didn't plan for, are the hands that'd ruin them slowly and in secret.
[ Any questions? ]
System 0 asked Warrior 01 who was listening carefully to the descriptions about each system, she felt she's slowly understanding what's going on but there was one thing she couldn't understand and that bothered her even more when System 0 finished explaining.
"How many knows about those stuff?"
[ None ]
"And why are you telling me all that?"
[ Because your ancestor said so ]
She pondered, why would her ancestor want her to know all that? Why not allow anyone else to know about those stuff? Why did she even let her live and sacrifice Ra's fertility for someone like her?
None of that made sense to her but she was still thankful, to be under such person's protection is a miracle itself, but one thing was missing.
"System 0? Didn't you say there were 5 systems? You had only mentioned three out of four, what about the last one?"
[ Ah! I'm sorry but I'm not allowed to mention any details about it. I might be in danger if I talk about it so I'll let time answer that question of yours. Until then, choose the system you'd like to lean on until you become stronger to deal with Training System ]