Sungrave Tunnels

The Sungrave Tunnels, ancient and labyrinthine passageways beneath the frozen citadel of Sungrave, emerge in Iron Gold as a perilous network of dark, twisting corridors haunted by howling winds and treacherous ice slicks. Offering clandestine peephole views into the segregated activities of the Society's castes, these tunnels serve as vital conduits for espionage and covert movement amid escalating tensions. Though their full potential unfolds only in the fourth book, they underscore the saga's motif of hidden undercurrents driving the revolution from the shadows.