Apophis (Tartaros Arc)

"So, Zeref let his guard down against the humans? Yet, they die so easily. The sole splendid thing... about them is their blood's brilliance."

- A recording of Apophis, short after Zeref was sealed away.

Apophis, also known as the Lord of Chaos and King of the Dead, he became known as the Best Friend and companion of Zeref and the second strongest Dark Mage in the history of Fairy Tail. Apophis was said to have helped Zeref turn Acnologia into a dragon and created a spell with his friend to give the Caster Immortality, to the modern day the knowledge on Apophis had been intentionally blighted over by generations of the Tartaros Dark Guild's membership, the members of Tartaros believe Apophis to be a God and that he has complete control over manipulating life and death to the extent that one day he will undo all of creation.

Trivia

 * In Egyptian mythology, Apep or Apophis is a Chaos Serpent, a monster and divine entity of Isfet, that will one day cause the world to end when it eats the Sun and its God: Ra.