Mask of Cassandra

The Mask of Cassandra is a powerful Esper Artifact. It is a small, black mask that was made from the corpse of Cassandra of Troy and holds the personification of her hatred and her powers inside of it.

Origin
Cassandra of Troy was cursed to suffer destructive premonitions that will always come true, but to have no one believe her predictions. She perished when a prediction of hers came true, that Troy would fall in a surprise attack and she would be taken and killed. She was buried so there after, with her powers permeating her hatred in her very corpse.

Years later, a group of individuals dug up her grave. They then carved a mask from her body, which then took in all of Cassandra's powers and her hate for all those who did not believe her predictions. The mask then sought to bring about all sorts of destruction with predictions.

Powers and Abilities
Probability Alteration: The Mask grants the user the ability to alter probability in their favor. This allows them to force a certain future to happen based on their will. However, for those who are not natural Espers, they are only allowed to cause one alteration, in exchange for their life.

Hypnosis: The Mask, while extremely powerful, cannot preform many feats without a host. In order to do this, the Mask will hypnotize anyone within its vicinity who gazes upon it. While enchanting a normal human with power, the Mask will feed on an Esper's ostracized life for its powers.

Weaknesses
Sealing Mask: A magical mask that is made to seal away evil can be placed on top of the Mask of Cassandra in order to render it inert.