Ultimate Skill

Ultimate Skill (究極能力) is the evolved form of Unique Skill and the final evolutionary stage of Skills in general.

Characteristics
Ultimate skills, as the name implies, gives the wielder 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's why no ultimate skill is identical. Only one individual in the universe may own a skill of this class until its current user is either killed or somehow lost the skill in some way.

As the story progresses, it's revealed that through certain methods, ultimate abilities can be imparted to others who have not naturally awakened them. The only requirement, like natural ultimate skills, is that the recipient must be a spiritual lifeform to receive it.

Angelic Line
Angelic Line (天使系) are a family of ultimate skills directly created by Veldanava bearing the name of angels. Among them, the most powerful in effect are the Virtues (美徳系), Veldanava's original powers turned to skills. After the world stabilized, he parted with all but Michael, gifting them to certain individuals, and releasing the rest into the wheel of reincarnation, where they awakened within the souls of the qualified. However, because they were too powerful, they were restricted to the unique skill level.

Although not directly stated, it can be inferred through the text that the Virtues had dormant egos built into them during their creation. With the exception of Michael and Ciel, when Chloe was temporarily placed under Feldway's Ultimate Dominion, her ultimate skill Sariel showed signs of a conscious, responding to Feldway by affirming itself as "Sariel".

All the ultimate skills of the angelic line are linked to the Lord of Justice, with control circuits directly built into them by Veldanava, placing their holders under the absolute control of the Lord of Justice.

Demonic Line
Demonic Line (悪魔系) are skills created to correspond to the pure powers of the angelic line. Among them the most powerful are the Deadly Sins (大罪系), skills derived from a person's fundamental desires. Though imitations, they boast the same potency as the angelic line. And just like their angelic counterpart, they awaken within the qualified as degraded unique skills.

Ultimate Skills
Rimuru Tempest:
 * Azathoth, God of Void
 * Shub-Niggurath, Lord of Harvest
 * Raphael, Lord of Wisdom (Formerly)
 * Beelzebuth, Lord of Gluttony (Formerly)
 * Veldora, Lord of Storms (Formerly)
 * Uriel, Lord of Vow (Formerly)

Veldora Tempest:
 * Faust, Lord of Investigation

Luminous Valentine:
 * Asmodeus, Lord of Lust

Yuuki Kagurazaka:
 * Mammon, Lord of Greed

Chloe Aubert: Velgrynd:
 * Sariel, Lord of Hope
 * Yog-Sothoth, Lord of Space-Time


 * Cthugha, Lord of Divine Flames
 * Raguel, Lord of Charity

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 Gluttonous King Beelzebuth." This is due to the Japanese texts themselves. (See: Furigana and Ruby Characters)