Against the Darkest Night: Prologue

Prologue:
Evil is the brother of good, the counteracting weight on the scale that balances out existence. Without light there is no darkness, without black there is no white. In Equestria, that balance has been tipped over to one side for many millennia, with evil making itself known in diminutive bouts, trying and bring the scale back to balance bit by bit. But mere whimsical chaos, like cotton candy clouds and chocolate rain pouring from the sky, or replacing the sun's brilliant glow with the moon's dimmer light, is not enough to match the amount of virtue and good that flows within Equestria. With the amount of virtuousness that this world has, with all of its carefree creatures and radiating positivity, somewhere deep in the cold darkness of the world, an evil of rivaling powering has formed. Chaos and Envy, two powerful advocates of evil were easily defeated by harmony and unity. Now, the question is, how will they fare against one of the most powerful, most infectious evils of all?
Corruption…