Arcane: League of Legends Episode 4 Happy Progress Day! Episode Title: Happy Progress Day! Episode Description: Several years later, Piltover prospers with Jayce's Hextech technology and celebrates its 200th anniversary on a holiday called 'Progress Day'. Jayce initially hopes to reveal his and Viktor's latest gemstone device at the ceremony, but decides not to after Heimerdinger warns him on its potential dangers. Elsewhere, Powder, now a teenager going by the name of Jinx, works for Silco, who she views as a surrogate father. She helps him smuggle materials, mainly Shimmer, into Piltover. A job goes awry when the Firelights, an undercity gang, interfere. While fighting, Jinx briefly mistakes a Firefly as Vi and has a violent breakdown. Caitlyn, an enforcer and Jayce's childhood friend, investigates what happened...