Ultimate Skill

Ultimate Skills (究極能力) are the successor to Unique Skills and the final evolutionary stage of Skills in general.

Characteristics
Ultimate skills, as the name implies, grants its wielder the ultimate power to control the very laws of nature. The only way to counter an ultimate skill is with another ultimate skill. That is the absolute, unbendable rule of the world.

If unique skills are born from one's individuality, ultimate skills are born when unique skills are brought past their limit. That is why no ultimate skill is identical.

As the story progresses, it is revealed that through certain methods, ultimate abilities can be imparted to those who have not naturally awakened them. The only requirement, like natural ultimate skills, is that the recipient must be a Spiritual Lifeform to qualify for it.

Trivia

 * In the story, the characters pronounce Ultimate Skills using only the being they reference and not the entire names used in the wiki and translations. Meaning, it's "Ultimate Skill Beelzebuth" not "Ultimate Skill Lord of Gluttony Beelzebuth." This is due to the Japanese texts themselves. (See: Furigana and Ruby Characters)