A series of thin, interconnected caverns and tunnels created by water running beneath the earth, all interconnected in a spiderweb downwards. The largest of these caverns can just barely allow a slim adult woman to squeeze through.
These caverns are everywhere and impossible to see from the surface. Because of this, the greatest danger they hold is as invisible pit traps. This is worsened by the Golden Absolution.
Where, originally, these zones were harmless, the Golden Absolution has taken out the plants whose roots stabilized these areas and provided no replacement. Areas of high Golden Absolution are still semi-stable, but that just means danger zones exist in seemingly random patches.
What makes Pit Traps dangerous is not any creatures residing within them, but rather the water that creates them. The further down in Munova you travel, the hotter and hotter it gets. Many of these streams reach towards boiling.
Burns are the most common injury acquired in Munova purely because of these pit traps. Abrasions are the second most common.