It all begin with a war, as undertale between human and monster, but the war of LegendTale was between World Saviors and Destructor. 2 humans looking race, but with insane powers. This war could end only if one of their master would win: Destructor had "The holder of Sciera 3 Types" as their master and the world Savior had "The holder of Sciera" as their master. After years of fight, the destructor won. Their evil plan was to keep the world saviors underground, and to slowly kill them. From these day until now, they were sending destructor underground to kill world saviors. Hopefully, world saviors defended themselves. But human who would fell underground may be taken as destructor and get killed for no reasons.
The story of LegendTale talk about that one humans, who fell here and wasn't took as a destructor. But as a humans. Well, he fall down at the wrong moment, the moment where destructor sent their most powerful person to kill the world saviors: The holder of sciera 3 types himself, wich was still alive. The human will hopefully and accidentely stop the holder of sciera 3 types, without notice that. The human will then meet Roselyn, a world saviors that still believe in humans and hope for a better future. She will try to protect as much as she can the humans. But he will go away after she understood how much he wanted to find his family back.
He will then meet Aurélien, One of the strongest world saviors ever existed. Even if the human will never know it. Hopefully, Aurélien, instead of attacking the humans, will protect him from any trouble he could get into. But Aurélien had friends that didn't think the same as him.
After meeting Aurélien, The human will meet Steven, the best friend of Aurélien, even if he want to kill the human or at least hurt him a lot to make him not dangerous. However, steven is very nice and will befriend the human.
The human will meet Aurelie then, another good friend of Aurélien, But she can't trust anyone and she kill anyone who isn't a world savior. Hopefully, the human, aurelien and steven will manage to make her change her mind, after a long fight.
The human will then meet Dr.Evelyn, the creator of everything that's underground. She doesn't really want to fight, but her creation wants to: The World Keeper, A robot that has the objective to protect underground from anyone. And it isn't gonna give up until it's destroyed.
After that, the human will eventually meet the king of all underground. Nobody really know his name. Everyone just calls him: "The boss". Even if the boss is a really nice guy. He won't let the human pass, for only one reasons: he needs his soul. So he will eventually try to kill him. But the human will win and the boss will lose. Eventually, the human won't kill him. In any case, the holder of sciera 3 types reappear here and kill the boss. He then transforms into... Well, nothing at all. He just gets 6 shields, that protects him from anything. His power is so good that he could destroy any world savior in one hit. But the human is so determined to win, that he will eventually win.
Aurélien then will understand what may have happen. Without telling anything to his friends. He will understand that this human isn't like other one and he's almost sure of what will happen. They will meet back. But will he have to fight, or will he have to help? There's is only 2 things left to do for the human: kill or befriend. And Aurélien knows that, and wait for the best... or the worst.