Great Hokai

The Great Hokai is an extremely major multiversal comet event that signals an upcoming nerf by Elyus (alpha god). It only occurs every 500 billion years, and involves all 12 universes having a massive power nerfing (weakening to balance out). The reasoning behind this is so that mortals do not achieve too much power, that they pose a threat to the multiverse, and essentially, existence itself (which is indeed possible). It is also just for housekeeping.

The nerf happens within a year of the Hokai, over a slow transition. The Eldreyn race is the only race to gain advantages from the comet; ultimate power. This built up into the Great Universal Revolution, in which they attempted to take over existence. That Hokai occurred in Age 1125. The next one will take place in Age 499,999,998,974.

Overview
Because existence is 1 trillion years old, there have only been 2 Hokais so far.

Ever since the creation of existence, the Alpha God Elyus has nerfed (sometimes retconned or rebooted) all 12 universes, following a 500,000,000,000 year cycle. This was to prevent mortals from gaining power at a constant (essentially becoming infinitely powerful) rate, to the point that they can easily destroy the universe, or possibly, the entire multiverse. The Hokai is a massive comet that can be seen in all 12 universes (very rare), and means that within the following year, the retcon is going to happen (a slow transition).

The more powerful an individual is, the more of their power will be shortened. A mortal that can destroy a galaxy may be pushed down to only being able to destroy half a planet (even using the same power methods). A mortal that can destroy a galaxy might only be pushed to being able to destroy a planet, using as much power as they did before.

Over time, however, the universe adjust to the new power scale, and mortals can get more and more powerful over time once again like a cycle, and eventually be back at universe-busting level or beyond (by which time it is time for another Hokai). There are exceptions of course.

Great Universal Revolution
The Great Hokai finally arrived into universe 7 on 5 January 1125. It was extremely bright, yet dim, and etched across the space sky like a paintbrush, for everyone to see. Many around the universe had their telescopes out to see it, including KJ and Kuzey atop a hill at the Earth Observatory. Sora, Asura, Leogian, Mars, Kyunameii, and Zion were there observing as well and asking questions. The Hokai was sent by Elyus every 500 billion years to signal a multiversal retcon is coming in 8 months. However it gave Eldreyn ultimate power, so they had to stop the System before then.