Lullaby

Lullaby is one of Zeref Dragneel's creations and the main antagonist in the Lullaby arc.

Lullaby arc
Erigor and his guild tried to use Lullaby to try to destroy the Guild Masters. But he was soon defeated by Natsu, so Kageyama tried to use him for the same purpose as Erigor, but Makarov convinced him not to. So Lullaby took on her true form as a wooden demon who planned to devour the mages's soul. Lullaby began chaos, but was soon defeated by Natsu and destroyed by Natsu, who is currently the Magic Council.