The Crystal Tunnels are a winding underground network where glittering mineral formations emerge directly from the cave walls. Rough passages branch and reconnect around crystal-lined chambers, giving the complex clear landmarks without making navigation simple. The reflective surfaces and irregular geometry make the tunnels feel distinct from ordinary gray caverns while preserving the natural, unplanned shape of the route.

In Age of Ashes: Fires of the Haunted City, the tunnels link deeper areas of the ruined dwarven complex and carry an unsettling supernatural resonance. For a GM, crystals can block movement, provide cover or mark important junctions while the twisting passages keep threats out of sight until characters are close. The map works equally well as a magical mine, resonant geode cave or subterranean crystal labyrinth where the environment itself supplies both beauty and obstruction.