Five Skies Beyond the Heavens

The Five Skies Beyond the Heavens (天外五天) are five outstanding martial masters who existed at the dawn of the Ancient Era. They can be said to be the progenitors of each martial path and are all likely within the Mythical Being realm. They are introduced in Chapter 180 of the novel.

There are five members:

Buddhist Sky (Heavenly Buddha), who had inherited the dharma of the Buddha. (Current Descendant: Boolsung)

Sky Demon (Heavenly Demon), who said that the demons could afford to walk above the Heavens. He is also the first Heavenly Demon. (Current Descendant: Hyuk Woon Sung)

Spear Sky (Heavenly Spear), who aimed to capture all of the martial arts of the world in a single spear. (Current Descendants: Nok Yu On and Hyuk Woon Sung)

Sword Sky (Heavenly Sword), who was going to display the might of Heaven in a single sword. (Current Descendant: Geomsung)

Soul Sky (Heavenly Soul), who would reach the Heavens with the force of a human soul. (Current Descendants: Inverted Sky Lord and the Cult of the Inverted Sky)

History
They regarded each other as competitors, but yet were comrades walking the same path, so they were specially connected.

“That relationship changed once the Soul Sky began to devour others, no longer embracing the soul of a human.”

The Soul Sky's actions were met with outrage by the other four Skies, with the Sword Sky trying to stop the Soul Sky and the Spear Sky refusing to help the Soul Sky.

It was because he had never made friends that the Soul Sky began walking upon the Unorthodox Path. He was so angry that he devoured the souls around him to form the perfect, embittered heart. That was the beginning of the Inverted Sky.

Eventually, the Soul Sky killed the Sword Sky and was deemed the universal enemy of the Skies and their descendants for generations to come, manifesting the generational battle in the Sky Demon/Spear Sky through Hyuk Woon Sung, Sword Sky through the Sword Star, Buddhist Sky through the Buddhist Star, and the Soul Sky through the Cult of the Inverted Sky.