So, talk about your world

Talk about how the apocalypse happened or how the world after is different from the one before.

My world, before the apocalypse, was just the standard earth.

An event or the epoch of convergence/Chaos, as I call it, led to few century of earth being mixed with the pieces of other worlds.

Surviving just this process is a lucky coincidence as most would not be fortunate enough. The pieces of other world still consist of their own region,culture or whatever living thing is on it, but the process of convergence with the part of earth it is merges with makes double the size of land there previously was, the land on both sides may be mixed together.

The things and beasts from other world are so crazy, they attack those including any insect,animal or any humans not like them. They themselves have a great aversion of violence, a cycle of eating, reproduction and violence. The beasts growth cycle is a lot more short than normal leading to a large number of hordes of beasts.

Now, my setting, starts several thousands later after the epoch of convergence has already happened.

The moon undergoes a similar case of convergence with pieces of other world, but it hurts apart after a century making a massive ring surrounding the earth.(And yeah, the size of earth is a lot more massive than it previously was)