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The mystical power behind human evolution.
Spiral Energy (or Spiral Power) is an ability innate in beings that have double helix (spiral) DNA, particularly humans. It is this power that allows them to evolve. It is a mysterious power; the amount of it varies from human to human and it completely ignores the law of conservation of energy, allowing it to create mass at will. Its overuse can also be dangerous; the Anti-Spirals refer to it as "Spiral Nemesis," and could cause the universe to collapse into a black hole-- which the Anti-Spirals attempt to prevent by controlling the population of humanity.
Creatures like Beastmen, who don't reproduce naturally, do not produce Spiral Energy.