Memento Mori

Memento Mori is a Curse which erases existence.

Description
The user produces a dark mist around the target that envelops them until creating a massive beam of dark spirits that reaches towards the sky. Known as the ultimate Curse and as the Memory of Death, this Curse was created to destroy the immortal being Zeref as the victims of this Curse are no longer alive nor are dead, but are simply erased, becoming nothing for eternity.

Trivia

 * Memento mori is Latin for "remember (that you have) to die".