Arthur is a young essence entity who spontaneously sprang into being on the outskirts of Vaporwave City. His life begins with him underwater, and examining a number of fishes. He rescues a fellow newcomer to Vaporwave City and ferries his companion to the shore. 

Arthur came into being possessing a total of four essences, and the ability to freely create any essence ex-nihlio as well as to edit essences. The essences he came into being possessing are 

Beings of vast power are capable of creating potions which contain superpowers, magical gifts, the DNA of various species, and other methods of transferring great and terrible power. These devices are known as essences. 

Essence Entity is the term which refers to those who have imbibed, or otherwise possess and are empowered by essences. No matter what a being was before they became an essence entity, once they consumed an essence they have become essence entities, creatures capable of great and horrifying feats.

Vaporwave City is a strange metropolis built on the coast of some continent in a faraway planet. For reasons that remain mysterious to even the most learned scholars of the city's history, something about the ocean off of the coast attracts visitors from all over the omniverse, particularly residents of different iterations of the planet known as "Earth" in many universes, multiverses, and pleniverses. In many cases these visitors do not plan to arrive here, and once every two years a strange event occurs wherein numerous extraterrestrial and extrauniversal visitors, affectionally dubbed "Fallers" by residents of the city, arrive in numbers usually no bigger than a few dozen.

In the not-so-distant past a group of people who were teleported to the ocean off the coast of the then-future site of the city banded together and created Vaporwave City as a place to help newcomers to this world, and more often than not this universe, adjust to this new place. The city cares for newcomers and goes to great lengths to integrate them successfully.