The Dagger of Mare

The Dagger of Mare (マーレのダガー, Māre no dagā) is a forgotten weapon from the Book of Zeref. The legend says that it has many abilities, such as Vampirism, Dream Manipulation and Illusion Magic.

Appearance
This dagger looks like ordinary curved-head dagger. This daggers grip is green, with an emerald at its end.

Location
Every June 6th, on the full moon, an enterance to the darkest cave in Fiore is opened, but stays opened only for a short time (while the moon is above the cave). The dagger is hidden in the caves darkest place. The only way to navigate through the cave is by a Celestial Spirit.

Vampirism
According to an ancient legend, if the owner of the dagger stabs a living being (Humans, animals or plants), it will absorb its remaining lifespam and turn the being into black ash. If the user is powerful enough, all the memories of that being will be erased.

Dream Manipulation
Another legend says that this dagger has the ability to manipulate dreams. If anyone gets 1500 meters close to it, the dagger will turn his/her dreams into nightmared, seing their loved ones dying or being tortured. The 'Mare' in its name is short for 'Nightmare'.

Illusion Magic
This dagger has the ability to manipulate someones visual sense, making his/hers worst nightmare happen right in front of him. According to legends, the illusion is so realistic that many people killed themselfs after coming close to the dagger.