The Cataclysm of the Mist

The Cataclysm of the Mist is an event that occured on the planet Mistoria. It occured when the planet Mandrilos and Mistoria crashed into each other. It resulted in Mist Ore becoming embedded into the crust and mantle of Mistoria, and a chunk of Mist Ore becoming the Mist Ore Moon.

Cause
During Mistoria's revolution around Nitros Prime, its sun, a different planet called Mandrilos came into contact with it during its own revolution, and the two planets crashed together. Thousands of megatons of rock began to fly into space as asteroids, and a lot of the Mist Ore embedded in the crust and mantle of Mandrilos became embedded in the crust and mantle of Mistoria. A chunk of raw Mist Ore also began to orbit Mistoria as the Mist Ore Moon.

Result
The Mist Ore Moon came into being after a chunk of raw Mist Ore was flung away from Mandrilos and into the orbit of Mistoria. Thousands of megatons of Mist Ore embedded itself into Mistoria's crust and mantle. Eventually, the Mist Ore Moon reacted with the Mist Ore within Mistoria, and Mistoria was blanketed in floodwater and mist. The water-levels lowered, and Mistoria became a forever-misty swamp planet.

Pros

 * Mistoria became a habitable planet
 * The Mist Ore Moon was created

Cons

 * Mandrilos was destroyed
 * Megatons of rock and Mist Ore were displaced