Shattered Sun
The Sun is broken.
Many ages ago, the Sun has sustained life and prosperity on our world. Everything that happened in the world went by the clockwork motion of the Sun across the sky, never ending in its motion and the benefits which the world reaped from it. People in particular became comfortable with the world, mastered in the existence of the Sun and all of the gifts granted by its Light.
In due time though, the Sun would become much less constant, much less perpetual than people had come to understand it as. Starting with a surreal crack and ending with the most terrifying roar one could imagine, the Sun violently unraveled in the eyes of the people. Emerging from the explosion was the most brilliant creature ever gazed upon - the mighty Phoenix of countless legends. It awakened from what happened to be its egg, our Sun, sprawling forth its flaming wings with an indescribable splendor. But that magnificence would soon turn into despair as the Phoenix did not herald the rebirth of the world as in the tales of the people.
Instead, the Phoenix had abandoned it.
The shimmering Light faded soon after the Phoenix's departure beyond the sight of the people. In the blast's wake approached a cloud of golden daggers, thrown to the discarded world as an assassin would do to a victim without remorse. As the Shards struck the world beneath the former Sun, the worst calamity in the history of the world came to pass. Entire civilizations burned to mere ash. The environment was irreversibly ravaged by the fires. The world's climate mutated dramatically in an instant. Everything the people under the Cerulean Heavens once knew vanished in a torrent of flame and destruction.
In due time, the fires died to a smolder. The world was set not in the burning light of a crimson inferno, but in a speckled sky of lavender as the Shards which didn't strike the world or fly into the inky abyss floated in the skies above. Dots of the Sun's former Light drifted through the darkened sky in all directions, perhaps lighting the way for the next chapter of the people, of the world.
For the Phoenix, Birth gives way to Death, which then gives way to Rebirth. When will the world be Reborn?
Overview
Shattered Sun is a setting created by a number of folks at /tg/, all sparked by the premise of "What would happen if the sun shattered?" It would take too much time to detail the evolution of the setting from the initial idea, but the folks at sup/tg/ has archived the original thread.