The End

The End is an entirely separate world from Rathnir and Eldham, similarly to the nether in this regard. There is no official term for everyone who lives here, but the most commonly used one is Endfolk. It's theorized to be many things, including an afterlife, a safe haven from the cataclysm that destroyed Paxia and Jagdas, and a place far beneath the void that it's horrors couldn't reach. Unlike the nether however, travelling to and from the end is only possible through an end portal, or powerful teleportation abilities that higher beings and endermen have. The former of which being almost non-existent in Rathnir and Eldham.

Geography
The End consists of numerous floating islands that are hundreds of meters long, and made out of the same material that The Boulder is made of. These islands aren't completely barren though, as life vastly different from that on Rathnir and Eldham, such as chorus plants, live on the islands and the space between them. These floating islands cluster together in rings, which are comparable to continents. In the space in between these rings is a kilometer long sea of nothingness. At the center of all of these rings is a lone island, called the Central Island.

History
In the most widely used calendar, called the Zenithian Calendar, time is divided into 2 "Free" ages, and 2 "Chained" ages. The end began in the First Chained Age, when an entity called "Void" destroyed Jagdas and used it's remains to create The End, and the first Endfolk along with it. This entity then enslaved said Endfolk and stripped them of their free will. Fortunately, another void being, called Zenith, came up from the void to give back their free will, in what's called the Great Liberation, marking the beginning of the First Free Age. This caused most the First Regime to dissolve overnight, save for a small portion of land now known as the Void Order, which remains loyal to this day. After this, the first 5 rings agreed to unite under Zenith, forming the Zenith Union However, this all changed when Entropy found the end, which she could access even while being imprisoned. She wanted it for herself. So, she amassed as many followers as she could, and made a deal with the Ender Dragon, a creature who roamed the Central Island since the end was first created. The Ender Dragon then overthrew Zenith and cast him into the void during what's now called the Great Schism. Zenith didn't go down without a fight however, and the schism resulted in many casualties on both sides. Afterwards, she swiftly took over the entire end once again, creating the Second Regime. and bringing about the second chained age. This new regime was officially ruled solely by the Ender Dragon, with Entropy instead being recognized as the god of the regime's state approved religion. Luckily, this chained age would only last a few decades, ending when Athaz destroyed Entropy once and for all and unwittingly freed the entire end once more, creating the dawn of the Second Free Age. In entropy's absence, the Ender Dragon stepped up to take her place, and was able to keep the central island and the 1st ring under the control of the newly named New Entropa.

Trivia
Regimes are referred to as just "regimes" because they didn't actually have an official name besides "The End", since both Regimes simply didn't have a need for one.