Desperate, Lyra dug through her late mother’s belongings and found a sleek, iridescent keycard: , unlocked. The software, rumored to be experimental, had been banned years ago when a glitch in an earlier version caused a city-wide “GemStorm”—a phenomenon where unstable creations absorbed ambient energy and exploded, destroying a block of the Ruby Row District .

A typical workflow in 5.19 looks