Arcane is officially canon, and from now on League of Legends lore is going to stop contradicting itself all over the place, says Riot
Riot's approach to League of Legends lore has always been a bit… flexible. Champion backstories have been repeatedly retconned, and the entire premise of the game has changed a couple of times since launch (remember when it was a literal sport?). More recently, as the Runeterra universe has expanded with books, spin-off games, and the TV show Arcane, inconsistencies have flourished, and it's been increasingly difficult for fans to point to an actual canon...
Read more.