The Great Beings of the Old World, the one before the industrialization of humanity, where the original rulers of the world. They were not a single, unified kind of people, but were instead an epithet used to describe being of great power, like the dragons, titans, or elemental spirits. They were worshiped as gods by many, but few cared little for religions humans made in their name. They instead focused on trying to rule all of creation all at once, and so they fought and waged war with each other for thousands of years, in what was called the Celestial Wars.
It was only during the war's end that they noticed their power was naturally dwindling, for in their arrogance they had failed to recognize much of the power of magic comes from faith, and the faith of mankind in the Great Beings was almost completely snuffed out. Some managed to survive by tying themselves to human society, such as being the figure head of a major religion, but most had died of either being slayed in the Celestial Wars or being reduced to mere myth and legend.
Very few Great Beings exist in the world, with the remaining few existing only due to a large portion of mankind's faith in their existence and power. But in the wake of the industrial revolution, the notion that magic is some great mystery deserving of respect or is even wholly good is seriously in doubt. Magic relies on faith and mystery, so in the new industrial age, it might be very well possible that science will over take magic's position as the dominant power of the world, whipping out the last of the Great Beings for good unless they adapt.
The titans are all dead and gone from the world. They were said to be massive humanoids, whose size could be as tall as a house or as tall as the clouds. They were considered some the mightiest of the Great Beings, with the ability to quite literally change the world with both their magic and their physical strength. But they were the first to go extinct as humans started to industrialize. The humans, for most of their history, worshiped the titans as wrathful gods. Their worship was made almost entirely out of fear of being destroyed. But when humans began to industrialize, and with the rise of science and logic as predominant beliefs, the strength of the titans began to wan considerably. Finally, in the capital of Great Zarith, Vargogard, humans had managed to kill the storm titan Trezder with a heavily armored airship that was capable of absorbing his lightning and directing it back at him. Once humanity discovered that the gods they feared so much could bleed, the titans were later quick to fade away into the annals of ancient history.
Perhaps the most adaptable and neutral of the Great Beings, dragons have survived into the modern industrialized era. Unlike the other Great Beings, the dragons left humanity relatively unharmed and unbothered, and they only participated in the Celestial Wars out of necessity and defense of themselves. Many dragons have been slayed by human hunters, and many dragons represent a present threat to humans. At the same time, some dragons have adopted to the new environment of industry humans have made, integrating themselves into their societies by providing guidance and magic that power their newly industrialized civilizations. A prime example of this would the Black Wyvern of Vurndraak, who has become so deeply integrated with Vurndraaki society, culture, and national identity that the two have almost become inseparable.