After my escape from Os Alta, the Darkling’s men had tried to penetrate the network of tunnels beneath Ravka’s churches and holy sites. When their searches turned up empty, they’d begun bombing: closing off exit routes, trying to drive anyone seeking shelter to the surface. The Darkling’s Alkemi had created new explosives that collapsed buildings and forced combustible gases belowground. All it took was a single Inferni spark, and whole sections of the ancient network of tunnels collapsed. It was one of the reasons the Apparat had insisted I remain at the White Cathedral.