Oterra
Oterra was a once lush and vibrant world, but its surface is now wasted after the events of an ancient cataclysm. The planet is now split into 3 distinguishable layers: the Sky Islands of Medonia, the Tempest Reef, and the Surface World of Oterra.
The Cataclysm

This cataclysm was caused by a mysterious corruption called Ink that mutated the world's creatures into monsters called Inkheart. The Inkheart ravaged society and mercilessly destroyed civilizations as they spread across the world. The last haven for humanity, Medonia, was saved by a mysterious man called the Philosopher. The Philosopher introduced the science of Alchemy to Medonia's people under the condition they stop using machinery.
They complied, and took up arms using their new Alchemical powers, but it was too late. The Dragons of Oterra had succumbed to the Ink corruption and joined the assault against Medonia. As a last effort, the Philosopher used his powers to raise Medonia off of the planet and into the sky, setting it safely on the clouds above and out of the reach of the Dragons.
Medonia and Guilds

Medonia is a floating city in the sky called home by millions of people. It is a democratic nation run by 9 Guild Masters (The World Council) that the citizens vote into office every few years. There are hundreds of Guilds in Medonia that act similar to contracting agencies for different types of jobs that assist society and its citizens. These jobs range from extermination of monsters, to body guards, and even special delivery services.
There are many regulations for Guilds that restrict them from becoming too powerful or corrupt. Some examples are that every Guild member is legally responsible for the actions of other Guild members, and Guilds are not allowed to sell goods directly to the general public. Regulations like these help keep the Guilds in order and also prevent citizens from feeling they are required to join one to live their lives to the fullest.
The Golden Dawn

The most prominent religion is the Order of the Golden Dawn, which strictly upholds the original teachings of the Philosopher, including his banning of machinery. Contrary to the Golden Dawn's beliefs, machines have started to increase in popularity after hundreds of years without them. The Golden Dawn publicly pushes for government regulations against machinery, and it has been rumored that they are also involved in shady terrorist acts of sabotaging large machinery that results in injuring thousands of people.
The Tempest Reef
The Tempest Reef is a protective barrier of storm clouds that Medonia sits on. This barrier is the only thing keeping the islands safe from the terrors of the Ink corruption that ravages the planet below. Nothing can pass through the Tempest Reef without being utterly annihilated.
And Now...
300 years after it's conception, the Tempest Reef is weakening, and the Islands of Medonia are dying and falling from the sky. There are rumors of a passage called Cloud's End that will allow a ship passage through the Tempest Reef to the surface world below. It is assumed that Mithos' father had found this passage, but he left no trace of its existence behind. The Guilds of Medonia now search for Cloud's End in hope to find a cure for their dying islands somewhere on the surface of Oterra.
