A long or maybe not so long time ago, nobody actually remembers when it happened but an unusual event has occurred all over the world. One day a billion rays of light pierced the earth and billion people were pulled towards the sky. Few hours after that event a magnificent rain made of light particles rained down the world of mortals. Every person who touched that rain was transformed. Cripples were healed and ugly people became handsome. The rain also had some weird effects like making people more peaceful. Rain had many magical effects on people, it's effects are still studied even today, after so many years. The rain ushered a new era for the people of the Earth and humans entered the time of before unseen peace. Earth became a paradise and it was truly a great place. But sadly our story is not about the people on Earth but about a one particular person who was pulled towards the sky when the light beams pierced the Earth.
To understand what happened then we first have to go back in time, to the place above the earth and outside of our universe. The place where he lived. He is all powerful and all knowing(sometimes). He is what the mortals would call a god. With just a flick of his finger he could easily destroy universes and with clap of his hands he could create new ones. In short he is super powerful, and that is what matters.
Appearance wise he looked like an old man with long white beard. Most of the time he would sit in endless void and look over countless multiverses. Every time he looked at his creations he would smile with joy. But after looking at the same thing again and again he became tired. No matter where he looked he saw the same thing. Over the countless multiverses he reigned over he saw one repeating pattern. All the intelligent beings he created were full of faults. Some were greedy, some were too prideful, some were gluttonous and others were full of wrath and aggression. After looking over them for prolonged time period he became tired of them.
At the same time he thought of an idea. The idea to create a beings without any faults. But he was too lazy to create a new race so he looked over many races he created across the multiverse to find the beings with the most faults. And to no one's surprise he settled on humanity. Humans were the first beings he created and as such they had the most faults. They inhabited every sin there was possible. Just the idea of changing them into perfect beings made him tremble. This would be his greatest creation ever, not only that it would show others his might. Transforming the race full of faults into a faultless perfect beings would show how great his powers are. Just the idea of others being awed of his powers made him excited.
The first thing he did after making a plan was to call angels to his dwelling. There were countless angel races around the multiverse not knowing what to do he closed his eyes and teleported to a random world inhabited by angels. He chose angels from this world as his minions. After making choice he teleported back to the void. Angel race was the most powerful of his creations and they would be a great audience to his show of power. With a clap of his hands he created a new planet and called angels there. Powerful angels flew towards that planet in the fastest speed they could muster up after god contacted them. 'Finally god had heard their prayers and called upon them! Their hard work paid off!' They thought.
Countless angels flocked towards that planet(I don't know how they travelled thru space but they somehow did). In that planet god created a podium and awaited for his servants. One by one many angels arrived and when the last one came god tested his microphone and said, "Almighty me heard your prayers and called upon you to serve me. I was touched by your sincerity and as such I called you all here to be my assistants for my upcoming project!" After he finished his speech many angels cheered and clapped with unstoppable vigor.
God waved his hands and said, "The project I'm working on is very important and I need your help to complete it! I want to create beings without any faults. I would grant humanity a better future but I don't just want to give them that. I am an almighty being and why should I just grant good things to others without any cost. I'm not their slave who just grants their wishes. I'm not that merciful! After many contemplations I came up with a way the humans could pay me for my merciful actions. I would take the lives of billion worst humans in the planet called Earth as a sacrifice! You have to find a way to calculate who are the worst billion people from 7.7 billion people on Earth. After I receive the human sacrifices I would make humans from planet Earth a better race which would lead them to great era of prosperity!"
God expected a roaring applause as such he stretched out his hands. However his proclamation was too shocking for angels and the whole planet became silent. After few minutes one of the angels raised his hands and meekly asked for a question. God looked towards him and that angel asked, "Isn't human sacrifices quite brutish and not godly?"
After hearing that angels words god thought for a moment and sudden realization came to him. He coughed few times and said, "Did I say human sacrifices? Oh silly me, I meant a.....challenge. I will give them a challenge. I will transport those billion people to a different worlds. The worlds they would be transported to would be a worlds where those people would belong to. If those humans like killing others I would transport them to the demon world where dirty socks are more expensive than morals and life! If they survive those worlds I could transport them back to the Earth and salvage them like I did go other humans! As a great almighty god I give them challenges and if they prove themselves I would reward them!"
After he finished his speech he again stretched his hands out waiting for applause. And this time the punctual angels caught on what god wanted them to do and so they started to clap as hard as they can.