Arcane Episode 4 - Happy Progress Day! Episode Title: Happy Progress Day!. Episode Description: Several years later, Piltover is prospering 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 the dangers it could possess. Elsewhere, Powder, now a teenager going by the name of Jinx, works for Silco and helps him smuggle materials, mainly Shimmer, into Piltover. When a job goes awry thanks to the involvement of an undercity gang known as the Firelights and a brief hallucination of Vi, Jinx attempts to impress Silco by stealing Jayce's gemstone and setting off an explosion that kills six enforcers...