Lullaby has two forms and thus, two appearances. It has its initial and default Flute Form and its Demon Form.
While in its flute form it is unable to speak, move or take action; and its size is nearly 50 centimeters in length. It has a skull with three eyes on one end, and an oval-like cutout in the skull's brow. On the other end, there are root-like cutouts.
When the flute transforms into its Demon form, it becomes an extremely tall beast that has three eyes, two legs, two arms and one head. There are many cutouts in its body.
The flute was once just a tool for "murder by curse" at first, which means that it curses the target and causes them to die. After getting into Dark Mage Zeref's hands, he further developed it into a magical flute, called Mass Murder Curse Magic that is capable of putting a death curse on everyone who hears its melody except for the Caster.
Erigor hoped to use this to kill the Guild Masters at their meeting. As Kageyama failed to carry out the mission due to regret for his actions, Lullaby transformed into its Demon form to feast on souls. However, Natsu Dragneel, Gray Fullbuster and Erza Scarlet were able to easily defeat the Demon flute. Once reverted to flute form, the light in its eyes and mouth faded away and his face cracked, eternally broken. It currently is in the Council's hands.
Magic and Abilities
Magic Beam: While in its Demon form, Lullaby is able to fire a magical beam from its mouth through a Magic Seal that is powerful enough to destroy an entire mountain in a single shot and the magnitude of such attack is enough to scare a battalion of the Fiore Royal Army into a full retreat.
Demon Form: Lullaby has the ability to transform into a large beast with three red eyes, two arms, two legs, and one head. Various cutouts are also seen from its body.
Appearances in Other Media
Fairy Tail Portable Guild
Lullaby appears in Fairy Tail's first official video game, Fairy Tail Portable Guild. It is one of the most powerful bosses in the game. Like most of the game's large-sized creatures Lullaby's size is greatly reduced.
Fairy Tail Gekitou! Madoushi Kessen
Battles & Events
|Zeref's Spells||Bloodman • Deliora • E.N.D. • Ezel • Franmalth • Jackal • Keyes • Kyôka • Lamy • Larcade Dragneel • Lullaby • Mard Geer Tartaros • Nemesis • Seilah • Tempester • Torafuzar • Yakdoriga|
|Etherious||E.N.D. • Seilah|
|Galuna Island||Bobo • Lulu • Moka|
|Unknown||Halphas • Sitri|
|Deceased||Bloodman • Deliora • Doriate • Ezel • Franmalth • Jackal • Keyes • Kyôka • Lamy • Larcade Dragneel • Lullaby • Mard Geer Tartaros • Plutogrim • Tempester • Torafuzar • Yakdoriga|
|Demonification Reverted||Neo Minerva|
|Former Devil Slayers|
|Deceased||Bloodman • Silver Fullbuster|