Although most "special abilities" possessed by demon hunters become mere "basic abilities" at the Impermanence stage, it doesn't mean that there's an absence of "special abilities" at this stage.
The divination of Gua Tianshi and the power of Ming Zhuo, which can cause all things to decay and wither, are abilities that set them apart from other Impermanence stage beings. Even though I only know ordinary flame manipulation, I also possess a superpower that can refine the enemy's soul into "slag."
However, the special ability of the Old Fist God is something I've never heard of. Generally speaking, the Old Fist God belongs to the extreme Physical Enhancement type. His power can easily throw mountains, and solely relying on "fist and foot skills," he could kill bizarre creatures and demon hunters he encountered on his growth path.
