Ability

An Ability is a unique power attained by harnessing the properties of a Spirit Tree.

About
Abilities are said to be the incarnations of spirits. Because they are rarely encountered in the world, they are the center of many urban legends, usually interpreted as "divine intervention" or "demonic possession." It is also rumored that acquiring an ability would cut the person's lifespan by a significant proportion.

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Spirit Tree
According to mythology, when the world had just been formed, spirits (each specializing in a certain element or power) descended from Heaven and sealed themselves in trees planted in the earth, the ocean, and the sky.

The Spirit Trees are rather small and have swirly, colored (usually related to the power they contain) leaves that seem to sparkle. They also bloom flowers in the spring and bear fruits in the autumn, the color being opposite of the foliage.

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Devil Fruit
The Great Drought caused the trees to wither, forcing them to seal their powers in a single, rather large fruit. The Great Flood washed the trees away, dropping the fruits and locking them away at the bottom of the seas. Demons rose from Hell and occupied them, leaving a curse that renders eaters immobilized in water.