Xu Huan traveled through the fairy world and obtained the elemental affinity system. He accumulated attributes and unlocked skills while living in the mortal world.

Feel the breeze blowing. After a while, the wind element will increase by 1. When it accumulates to 10, the skill [Wind Chant] will be unlocked.

Walking barefoot on the dirt for a whole day will increase the Earth Element by 2. When the Earth Element reaches 10, the skill [Earth Protection Technique] will be unlocked.

Lying in water for a night will increase the water element by 2. When it accumulates to 10, the skill [Basic Healing] will be unlocked.

Xia Tian was struck by lightning, and the lightning element +10 unlocked the skill [Lightning Induction].

…

Countless years later, Xu Huan had accumulated hundreds of millions of elements and became the Immortal Lord of All Laws, the only one who is supreme.