This field of necrotic energy is impossible to pass through. However, given the right timing (or a short pharmacist) it is possible to exploit small impurities within the field. These fields can either be a simple barrier, or a complicated dimensional crossing into the Shadow Realm. These crossings can induce nausea and fainting as your body adjusts to the new a, b, and c spatial dimensions.
Shadow Field Locations:
Around Twinleaf Town