Acid Ground is a trait of some Zones where there has been heavy pollution. This pollution has led to the ground becoming acidic. This acidity can harm the feet of characters, causing Blunt Damage to Legs. This trait has no effect on Hive or Skeleton characters, as they are immune to all forms of Acid. This also has no effect on Robot Limbs.
Human and Shek characters can easily be protected from this by wearing any type of Footwear.