Zeref

  Zeref is considered the strongest and most evil Mage in history, who possesses very dangerous and powerful Magic. He currently appears as a self-hating, reclusive youth who cannot control his power. He is also known as Death God or Black Mage.


In the modern age Zeref isolated himself and seems to have a gentler, melancholic personality. He is often seen behaving calmly in extreme situations. He apparently wishes to die to atone for all the sins he has committed and may commit in the future, and when he realizes that Natsu isn't ready to kill him yet, he breaks down in tears. He commits incidents without his own knowledge or out of his own control, as seen when he kills Zancrow.
However, he is still shown to be extremely intimidating when angry, and will not hesitate to punish those he believes to be evil, such as Grimoire Heart.

Black Arts (黒い芸術 Kuroi Geijutsu): He was able to master all forms of Dark Magic at a very early age, and brought countless demons to life. His Magical strength is so enormous, in fact, that he cannot consciously control his own Magic, though whether this was always the case is unknown. Zeref's lack of control over his black arts seems to come from his emotional state. He has stated himself that his kind heart that cares about lives causes his powers to run out of control and randomly kill, but when he hardens his heart and becomes like the cold, ruthless Zeref of legend, he has complete control of his magic. 

• Death Magic (死の魔法 Shi no Mahō): Zeref has the ability to cause any living thing around him to die when he uses Magic. The name of said Magic is unknown. This Magic seems to burst at random times but he can tell when it is going to happen, so this gives people a chance to escape. Certain things can protect people from the wizard's blast such as Natsu's scarf saving himself, Evergreen, and Elfman. It is implied that the Magic activates whenever he is agitated, scared, or surprised. Zeref involuntarily releases a wave of Death Magic and anything hit by it dies. He later reveals that his body is cursed by this Magic, as when he understands the weight of a human life, his body will at random times bring death to his surroundings. When Zeref doesn't care about lives, he is fully able to control his Death Magic.

• Death Wave: Spell used twice when Zeref met Natsu, Elfman and Evergreen. It creates a dark wave that kills everything in the vicinity. Natsu was able to escape this effect due to having Igneel's scarf on, but it turned black instead.

• Death Orb: Death Magic takes the form of a black orb, which absolutely destroys everything in its path.

• Death Pillar (Repentance) : Zeref swipes both of his arms in a circular motion until the bottom of his hands meet. The hand on top has the index and middle fingers pointing upwards, while the other hand has the little and index fingers pointing downwards. While doing this, he is surrounded by a dark aura. This spell created a huge vertical explosion, and it's blast radius is seemingly controllable. It was used to kill Hades.

• Living Magic (生活魔法 Seikatsu Mahō): Apparently a very ancient, long-forgotten form of Magic that brings things to life under the master's control. Some creations of Zeref have minds of their own and continue his unknown evil quest. Most of his creations are giant demons.

• Deliora (デリオラ Deriora): Deliora was a monstrous demon that attacked the icy villages in the North. According to Erza, Zeref created it. Deliora was imprisoned in a block of ice by Ul. Lyon Bastia tried to unfreeze it so he could kill the demon, however, after years of being imprisoned in Ur's ice, the demon's life force was drained so much that it died before Lyon could attack it.
• Lullaby (ララバイ Rarabai): A flute that can transform into a giant demon. Whoever hears Lullaby's song (aside from the caster) will die. Erigor hoped to use this to kill the Guild Masters at their meeting. As Kageyama failed to carry out the mission due to being changed, Lullaby transformed into its demon form to feast on souls. However, Natsu, Gray Fullbuster, and Erza Scarlet were able to defeat the demon flute. It currently is in the Council's hands.(Its Magic Seal is what we assume Zeref's is, however this is likely not the case as even though it was controlled by Zeref, the Lullaby still had its own thoughts and will so it probably also has its own seal).