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Sigma and Sombra didn't know how they ended up on Krakoa during a battle against Talon on their world. Sombra already planned to desert Talon to save Sigma, and was given the opportunity, when the new Overwatch would attack. She got the data on the research, so it would be safe.
She and Sigma used the chaos to fight back, when they suddenly vanished, both of them. They would not be seen for a while. Later, Overwatch would investigate the phenomena that caused their disappearance with the help of Lifeweaver and his love, Mantis.
As for Sigma and Sombra, they were on guard, before they encountered Magneto, who went to investigate the strange flash. The latter was in shock and awe of two people who were standing up. He quickly disabled her tech using his powers, before she could hack him with hers, as she looked ready for a fight.
Once she calmed down, she explained that she and Sigma were lost and on the run. Magneto, seeing that two people, that were likely Mutants due to them having powers, needed help, agreed to take them to safety.
"Gracias. I'll ensure that people are safe here, and I'll gladly pay back the favour for us staying here," Olivia answered.
"There is no need to 'pay back' the favour, child. I will ensure that you are not followed by your pursuers," Magneto said, as he got them to safety away from the forest. He did reactive Sombra's powers on the spot, so Sombra turned invisible.
During her first few days on Krakoa, Olivia got the upgrades to her tech to adapt to this part of the universe, and during this time, she spoke in great lengths about the world she and Siebren came from.
Let's just say that Magneto had a lot of to digest with the stories that she told.
It was decided that they would stay, until the threat of Talon on their world was dealt with by Overwatch, that fought from the shadows. Olivia would work to end the threat of Dooms and still worked on figuring out the Conspiracy of her world, given the intel she had.
While looking after Siebren, of course.
Emma approached Magneto, who from afar watched Olivia interact with Siebren one evening.
"That man can't stop babbling about the music and Universe," Emma remarked, clearly annoyed. She had a different opinion about Olivia, given that Olivia was working with her tech all the time.
"It was...not a pleasant situation that he was in, before she rescued him and they found themselves here through unknown means. I found them and took them to safety, as Olivia, or Sombra, was concerned for his safety. I can tell that she cares for him. They are not of our world.
"They are from the world, where people do have powers, because of it being a futuristic one, but close to being like ours in any timeline" Magneto responded.
"So, there are Mutants on their world?" Emma inquired.
"No, and perhaps yes, with certain cases. Siebren's powers came as the result of the experiment going haywire, that it shattered Siebren's mind. He even retreated into his mind further during his imprisonment. Gabriel, or Reaper's powers came with a science that rendered his life a torture after he was on the verge of death.
"Olivia told me of the girl named Illari, who is the last of her kind. I suspect that she is a Mutant because of using the powers of the Sun, that her people were able to use, and she has the gift of such powers. Unfortunately, she reminds me of Wanda, with what happened to them concerning their powers.
"Additionally, the Shimada brothers named Hanzo and Genji could be Mutants due to their inherited ability to summon a Spirit Dragon, same with a young woman named Kiriko, who can use Magic and summon a Spirit Kitsune. Everyone else's powers could be because of science, cyber enhancements in Olivia's case, or incidents, like with Siebren.
"Five years ago, Siebren was broken out by Talon, who heard of his research, and were able to locate the facility where he was being kept. That was when Olivia met Gabriel Reyes.
"She is Siebren's only friend, and as such, swore to protect him. Given the magnitude of his powers and research, which they also took with them, I am not surprised that Siebren was seen as nothing more than a weapon by the rest of Talon."
Magneto sighed with sorrow. "Olivia lost her parents during the first Omnic Crisis. She is not alone, as 30 million children were orphaned during the war. A man named Baptiste, the Healer of Overwatch named Mercy, they also lost their families. The total casualty number on the human side was over a billion.
"Ramattra, an Omnic and the Leader of Null Sector, reminds me of myself in my youth, given that he sees that the peace between Humans and Omnics, the Robots who are sentient, impossible. And like myself, he had a fallout with a friend of his named Zenyatta, an Omnic Monk, who is said to have taken in the apprentice, Genji."
"Using a human being as a weapon, especially with a broken mind, how despicable," Emma thought. She had powers to entrance her foes, but she was none too pleased about what happened to Siebren during his time in Talon. "I assume that the research is out of Talon's claws."
"It is. Olivia took all the data safely. She'll give it to Overwatch, once they find their way back to their world. The timeline mess also now brought their world into this, no doubt," Magneto responded.
The two also discussed the war that caused so much destruction on the old world, and how Omnics were treated like Mutants. Magneto did hear that the Atlantic Arcology became home to many Omnics that fled the prosecution, and as such, it was that world's version of Krakoa.
Magneto hoped that Talon would not come here, or it would be their end.
When Doom came to Krakoa, Olivia and Siebren joined in the fight against Ultron to protect their new home. They also attended the party as well, where they saw all people invited. Among them were Wanda and Illari, who found their way to here, as Illari heard of Olivia vanishing. Same with Namor, the king of Atlantis and a healer named Wuyang.
Olivia was relieved to know that Moira found her death at Reaper's shotguns. Reaper found a new life with Jack Morrison, who no longer pursued his former archnemesis.
It would be a while before Olivia and Siebren would return back to their world, as they found Krakoa a new home, away from the chaos.