The Days of Fury are global disturbances that affect the planet Mobius periodically in history. These series of seperate but equal calamities are described within the Echidna Tomes as "Nature's way of adjusting to environmental changes it undergoes over a certain duration" according to the eldery Echidna named Athair.
First Day of FuryThe first Day of Fury occurred approximately 11,900 years ago, several decades after the Xorda race began their attack on the planet using the Gene Bombs. The bombs, which were supposed to preserve the planet's environment as it was at the time of their use, instead triggered massive volcanic reactions on a global scale, which hurled billions of tons of dirt and ash into the planet's atmosphere, preventing most sunlight from reaching the planet over a millenium. After thousands of years, the sun finally burned through the ash and dirt in the atmosphere, allowing for the emergence of the Mobosaurs, a dinosaur-like race which was the newest dominant species on Mobius.
Second Day of FuryThe second Day of Fury occurred roughly 10,000 years ago, when the remaining energies of the Gene Bombs reacted with beryl deposits beneath the planet's surface, forming the Chaos Emeralds. Once formed, a cataclysmic reaction happened, sending the Chaos Emeralds into the sky, only for them to rain down upon the planet once again. This even was called the Coming of the Chaos Emeralds. This resulted in catastrophic changes to Mobius' weather which in turn caused the mass extinction of the Mobosaurs. Some time later, such devastation was wrought upon the world of Mobius by the Forgotten War, a long-forgotten ancient battle between the Order of Ixis and the Albion Knights of Aurora is believed to have brought about additional Days of Fury.
Recent Day of Fury
Another Day of Fury occurred roughly 1,200 years ago according to the Echidna Tomes.
The most recent Day of Fury occurred in 3236, causing severe weather changes all of Mobius. Sonic the Hedgehog and Miles "Tails" Prower were forced to land their plane Winged Victory because the stormy weather was so bad. Mobotropolis was rocked by a violent windstorm and snow rained down on Knothole. Even parts of Angel Island, such as Sandopolis and Echidnaopolis, were affected by the Day of Fury. The weather patterns there adjusted from blizzard snow storms to torrential rain fall.
- It is possible a rather massive Day of Fury occurred 3,237 years ago (when the year was "0" for the Mobian calendar) though this is not known for sure.