Roan

The largest diaspora in the world are the people of Tere de Ro, the Roani, colloquially dubbed as "Imperials", and derogatorily addressed as "imps" or "sun-watchers". They consist primarily of humans and their closest relatives: elves, gnomes, halflings, half orcs, dwarves, tieflings, and goliaths-- and naturally have a great variety of different subcultures and ethnicities amongst each other. Despite this, most have collectively adopted a common identity around their exodus from Tere de Ro as a result of the Civil War and the arrival of the Twin Cataclysms. There are however a few distinctions to be made among those who are a part of the Roani Diaspora: Most Roani are proud, entrepreneurial, idealistic people who often stick to their original traditions (such as the worship of the Sun as a major deity among a diverse pantheon, and the veneration of magic and magitech), or may synthesize local cultures and traditions into their own with genuine and sincerely good intentions of integrating with their neighbors. Often times when they do this, however, they cross the line into appropriation, and do bear insults of being imposters or invaders or even colonizers by their indigenous neighbors. As a result, some Roani people double down on their identity and speak of starting a new Imperium defined by an idealistic utopian vision dripping in nostalgia. This is largely a sentiment shared by those who weren't alive to witness the tragic civil wars and ultimate price of the "Imperial Hubris". For those without this feeling of lost glory, most Roani are starting to let go of this identity and fully immerse themselves in the local cultures, slowly on the path to becoming Luan to some degree or another. Some of the oldest and most educated Roani still know of their technological and magical heritage as well, and are some of the last fonts of advanced knowledge remaining in the world-- if they can be convinced to share their history.
However, there is a plenty of friction between the Roani and Luani: as previously stated, many Luani view the Roani as invaders, colonizers, refugees, unwanted guests, and worse. Plus there is a deep suspicion towards Roani/Erudite Magitech, and while plenty of Luani will use magitech themselves they still regard many artificers dubiously. It also doesn't help that many of the Roani consider many of the Luani denizens, particularly those with more animalistic or monstrous features like Lizardfolk, Kenku, Tabaxi, Hobgoblins, and Wood Elves as backwards at best and ignorant savages at worst. It is not uncommon, even 300 years after the great exodus, for riots and exiles and other forms of sectarian violence to pop up here and there, as unsightly and persistent as a case of bad acne. What's more, many Luani (rightfully so but for the wrong reasons) blame the Roani and Erudites for the state of the world, from the natural disasters following the Shattering of Tere de Ceu to the conception of the Twin Storms: plenty of paranoid and territorial Luani believe all of this is part of a secret plot to wipe out the less developed peoples of Tere de Lu to start a new Imperium. Others believe that it was the mages and magitech engineers and artificers who were responsible for the tragedies of the past-- an opinion which surprisingly many Roani share as well.
The aesthetic and style of the Roani are deeply inspired by Ancient Roman, Helenic, and High Moorish-- they reflect Earth's Mediterranean Medieval to Industrial art, clothing, and architecture with plenty of variations among the different races (Elves enjoy more naturalistic art a la Tolkein's Eldar, Dwarves are very Gothic/Germanic, halflings are very much into cottage core etc.). A very sedentary and territorial people, the Roani enjoy large buildings with open spaces, high walls and hedges, lots of windows, and also were famous for marble columns and baked brick and concrete constructions with tiled floors and rooftops. They were most famous for their public baths, decorative mosaic walls, well maintained infrastructure, stalwart fortifications, and imposing skyscrapers of old. Unfortunately, much of these things are lost to Ro, or a few sparse ruins from ancient colonies and trade posts and research stations centuries old on Tere de Lu and Tere de Ceu.