I Became the Strongest God of the Tower

I was an ordinary girl... until the day a mysterious note appeared: "If you wish to learn the truth of your brother's death- Climb to the top of the Sanctum of Trials." For two years, I chased a ghost - the murderer who brutally took away the only family I had left. My parents died in a plane crash when I was young, and my kind older brother was the last light in my life... until he was taken from me too. Grief became rage. Love became obsession. Revenge became my only purpose to live. And then - the portal swallowed me. When I opened my eyes, I stood inside a colossal Tower that connects countless doomed worlds, surrounded by people from different planets, eras, races, and bloodlines - humans, elves, dwarves, orcs, even newborn gods. A glowing System screen appeared, announcing us as participants chosen to climb for the entertainment of gods who lurk beyond the skies. Each of the 100 floors contains a world on the verge of collapse - a tragic story doomed to repeat forever. To ascend, we must save that world's ending while trapped inside the life of a character who belongs there. If we fail... we die.