As Jack Clark cultivated the Great Sun True Body to the ninefold grand accomplishment realm, he discovered that his body had gained a new ability, absorbing sunlight.
This 'sunlight' doesn't merely refer to the radiance emitted by the sun, a star in the Solar System; it also includes the sun suspended in the heavens of the mythical world, as well as the sunlight of this world.
This ability originates from the Great Sun True Body technique.
Starting from the Second Layer, he absorbed sunlight to strengthen his body, directly ignited the Qi Blood's fire to temper the flesh at the Fourth Layer, and formed Solar True Fire at the Seventh Layer.
Step by step, tempering the flesh, changing the physique, he gained the innate ability to absorb solar energy, similar to the ability of the Dark Star Rune to absorb metals and heavy elements.