(I recommend watching Arcane before reading this. To those who have, I'm running this story based on both personal and community theories after Season 2 Episode 9)
A year has passed since the Battle of Piltover and the Hexgate Collapse. Jayce managed to live on from Viktor's disappearance and has recently continued his work at the Academy, though now as a physics professor. Ekko continues his work with helping those in need both in Piltover and undercity with Jayce and the now un-retired and now-returned Heimerdinger taking him under their wing. Caitlyn has taken her role in the council and has worked in cooperation with Sevika and fellow council members to improve life in both cities. Vi has taken her role with bouncing around in both helping Cait in her work life and her undercity life. And one man, a certain Marcus Tallow, returns to Piltover after his venture in Demacia. Now a new threat in the shadows emerge, the political climate of Piltover and Zaun more charged than ever, and maybe a return to the "Era of Magic".