The turmoil in Runeterra has torn apart the false veil of "just order" in Demacia - the aristocracy colluded with the Piltover plutocrats and Noxus, turning the forbidden magic stones that protected the people into tools for smuggling and profiting. The waste was poured into Zaun, causing the civilians to crystallize. The Void forces were infiltrating the top management through corruption, and Jarvan III became a puppet.
Galen, the power of Demacia, broke into the shady trade of the Forbidden Stone, but was placed under house arrest by the royal family and betrayed by his aunt, and his former loyalty completely collapsed. The Noxian Assassin Katarina was ordered to kill him. When she saw her father's military badge and saw through the high-level conspiracy to silence her, she switched sides with a knife and vowed to "fight for the truth." When Caitlin, a Piltover policewoman, traced Hex's contamination, she broke procedural justice amidst the cries of Zaun children and formed an alliance with the two. Galen's sister Lux awakened light magic in the Forbidden Prison, melted the shackles of the Forbidden Stone, and became the key to connecting the magicians and the reformists. Darius, the former sworn enemy of Noxus, Inswein colluded with the Void Devouring Legion and turned to side with Galen. Everyone obtained transaction secrets from Pi City's black market, sneaked into the palace to rescue Lux, and unveiled the "Final Plan" at Mount Targon - the Void will borrow three keys to open the Devouring Door. In the final battle, Lux sacrificed light magic and integrated it into Galen's reforged "Demon-Breaking Blade". Katarina assassinated the Void Priest, Caitlin sniped at the energy node, and Darius purified the corrosion with blood rage. The four forces resonated and defeated the Void Lord.
