Final Day

The Final Day is a strange phenomenon that appears to transpire every ~50 years, although lower-scale versions occur more frequently. The exact cause of the event has remained elusive despite several centuries of studying from various countries. Various side effects tend to follow its appearance, suggesting it may be able to predict incoming disasters.
The most widespread and well-known instance occurred during the summer of 67BCE; inscriptions and writings recovered from this period indicate that the sky turned unusually dark in the morning and shifted to a very strange purple, then to a light yellow. By the afternoon, the sky had turned dark again and stayed that way for approximately 3 weeks, the sky morphing into the aforementioned colors at seemingly random periods and with random durations. These are still used to identify the Final Day today, as all instances of the phenomenon share this in common. Smaller scale Final Day instances sometimes have no changing colors, staying dark.
At some points, even at the normally warm latitudes of the Mediterranean, abnormally cool winds were reported, adding to the confusion. At the beginning of the phenomenon, a strange booming noise was heard from a large distance, but some accounts say it sounded "akin to an angry beast's roar." It is believed that an asteroid could have hit the Earth that day, but no traces of any impact crater have been found, and sources from locations reaching from Tunisia to China report hearing the noise at the same loudness. It is theorized that, if an asteroid did indeed hit Earth, it may have actually landed in the sea rather than anywhere on land.
Many reports from primary sources around the time mention people believing that the world was ending. Some also thought the planet was being engulfed in a massive capsule, or that the gods were descending to enact judgement upon Earth. This led to it being called The Final Day, which was eventually used as the name for all instances of the phenomenon. In China, at least 750 died due to being blinded from unknown causes. This also caused a decade of unrest in China, as floods led to chaos throughout the Yellow and Yangtze valleys. As well, in Greece, boulders and rocks reportedly fell from several mountains that had no signs of erosion or landslides, which caused several houses below the slopes to be severely damaged by the boulders. A source from several years after the event suggests the island of Rhodes was hit by a massive wave. There is also evidence that China, soon after the event, suffered a massive raid from Mongol tribes, which would not be eclipsed until another raid a century later, which ended up causing the collapse of the Early Han. 
Another well-known occurrence of the Final Day happened in Tibet during 209AD, where the sun supposedly "went out" and the sky darkened to a pitch black in half a minute; over 450 people disappeared in Tibet following the event. It is the most well known lower-scale Final Day, due to it being intensively studied by Chinese and Tibetans during the Terran Confederation. 
Some scholars believe that technological advancements are linked to the Final Day. Others believe that the comet may have a connection to it, due to it being sighted during some Final Day instances. This is likely a coincidence however, as it has been more commonly seen long afterwards. Some suggest more absurd theories about why it occurs, such as a connection to the Gulf of Ob, or supposed mysterious lines in the Sahara, or even a connection to the sewers. None of these theories have gained much traction, and the cause of the phenomenon remains a mystery. 
== List of supposed instances of the Final Day ==
=== Large-scale events ===
c. 1000BCE - 900BCE, India. No evidence for it occurring at this time exists besides a few rock inscriptions in the Indo-Gangetic plain. They have been studied by various Indian scholars.
c. 500BCE, Persia. The only evidence that alludes to the phenomenon is a series of damaged documents found in the Alborz mountain range. 
67BCE, the Mediterranean Sea region and central China. Widespread flooding and famines followed it across Greece, Anatolia, China and the Balkans, as well as many sudden deaths including knez Prijedza I. Some Italian polities also experienced major chaos, while China fell into chaos for a decade. It is also possible it was visible elsewhere outside of these regions. 
73AD, Hawaii, California and possibly the Great Basin. Less than 1 year later, the Sultan of the Nicolides would disappear. The Final Day was documented by Nicolideans living in Honolulu, as well as native Hawaiians. Native Americans in the Great Basin later told stories of a "sudden change of color in the sky", supposedly followed by unnatural flooding in dry riverbeds.
125AD, France, Germany and the British Isles, several weeks before the First Worlda War began. It may have caused the Scottish leadership to fully decide to go to war with the Colonials. Many considered it a warning sign, as there were myths of similar events in the distant past within western Europe. Most news circulated about the phenomenon within Scotland was heavily censored, despite the Byzantines and eyewitnesses knowing of it.
189AD, the North Caucasus, the lower Volga region, Central Asia and northern Iran. The Kuban and Volga rivers were heavily flooded for the first time in decades. Dust storms also occurred in Central Asia. A few days after the phenomenon ended, Bimbisara was shot. Bharatian writers declared the event as a bad omen. Many citizens in Pataliputra heard "ravenous squeaking and laughing" beneath them, which may have somehow been connected.
227AD, Turkey, Ukraine, Romania and Georgia. Black Sea storms intensified for no apparent reason. The Comet was also spotted. During the same year, Azerbaijan rebelled against Byzantium, and a few years later, the Solar Flare occured.
270AD, Scandinavia, northern Scotland, Iceland, Svalbard and Sapmi. The October Revolution began a week or two after it ended, leading to the downfall of Finland.
there should be something between here and 376
376AD, The Maghreb, Egypt, and various Mediterranean Islands. Muhammad of Libya died during this time. As well, many other world leaders suddenly died including Rob Maull and Markueerikki-Aaltonen.
Category:Implied
Category:Mysterious/Paranormal