A very powerful Solo Numbering Skill. Rank 1
The strongest skill known to humanity. It is a skill which Kim Kangtae, the strongest human, uses. Kangtae trusted this skill to constantly heal him and fought like a mad warrior in the front for as long as he didn't die.
This skill is famous on its own but was made to be considered the Number 1 skill known to humanity due to Kim Kangtae's exploits. This skill, which has the highest efficiency out of the discovered skills, wouldn't lose out even when compared to the Zero Numberings.
Immortal Soul turns the user's body close to an immortal's. It allows one to fight like a "Mad Immortal" in the battlefield with no worry about injuries or stamina due to the extreme regeneration granted by the skill.
Immortal Soul raises one's soul and body to the extreme. It's main power was survival and it utilizes every skill and everything one had to survive. It would heal the soul with mana and create a foundation for the Skills of Annihilation (Zero Numbering) to grow.