Lareas Alliance is the name given by modern nations for the oldest known civilization in the entire local universe, which was first created in the Lareas region of the Florathel Galaxy. It is unknown which planet they were founded on. The first known evidence of their existence is from roughly 7,128,320,000 years ago, which means that almost no artifacts remain from the civilization. Because of their antiquity, they stand as the most mysterious species in the Florathel Galaxy region.
Most scholarly discussions of Lareas Alliance often rapidly tend towards vagueness and a frustrating lack of solid evidence. There isn't much evidence that they were ever even there, but what little evidence there is points to some sort of civilization spanning almost the entirety of the ancient Telusian Cluster, with towering cities and heavily colonized planets dating to over seven billion years ago.
Absolutely nothing is known about the multitude of species which inhabited it. The different species are often portrayed as different colored clouds of smoke as a placeholder until we find literally any information about what they look like. They have become the figures of folkore in countless advanced civilizations due to their seemingly impossible megastructures (among other things) and, and would continue to be treated as such even into the present day thanks to their extremely sudden disappearance.
The first nation to discover evidence of Lareas Alliance that we know of is the Providence Union, a nation which colonized the entirety of the Florathel Galaxy and its nearby satellites, a little over two billion years ago. Once evidence was found, many of the citizens were likely fascinated by them, and how exceedingly powerful a civilization they were, and how they seemingly completely vanished into the wind.
The most well-known relic of their existence was likely the "Impossible Dyson Swarm" surrounding the star Lykare, as the dyson swarm should collapse in minutes, but it has been standing since at least the fall of Lareas Alliance itself.
They would also create the planet Deralend, located in intergalactic space near the Avana Galaxy, and its strange appearance, like a black hole with land. Very little is known about this structure, and it seems to erase any craft approaching it from existence.
Much later, the existence of Lareas Alliance was discovered by the United Nations of the Florathel Galaxy. Though many of their relics would be lost in the calamitous events of the Fall of the Providence Union, some remained, such as Deralend and the "Stellar Rosette", a system in which eleven almost identical red dwarf stars orbit each other in a ring, and have several habitation megastructures surrounding it.
Recent studies on the extremely enigmatic intergalactic globular cluster Telmarai shows that it was involved with interactions with Lareas Alliance, which ended with the enigmatic civilisation propelling Telmarai to a significant speed of light out of the Florathel Galaxy because of large-scale conflicts. There is evidence for this in the form of large dust clouds containing explosive, hypergolic and radioactive material near the site where Telmarai originally left the galaxy.
One of the most archaeologically interesting sites related to Lareas Alliance is the planet of Psinus Majora. Psinus Majora is located in territory affected by the Forever War, and as such is not studied anywhere near as much as it deserves to be. Aside from this, there is a bizarre megastructure located just outside of the territory of the Cnara-Frealee Federation known as the Kiloro Spheres. The Kiloro spheres appear to be completely solid with no active support structures, and seemingly no purpose either. It is a mystery why the things haven't collapsed billions of years ago.
Monolynths are strange megastructures that populate the planets of the universe. Created by Lareas Alliance, they come in all shapes and sizes, with terrain of all types, fitting for species across the galaxy. Interestingly, they appear in orbit around only gas Giants, such as PInoV, Jolies, Belumak, Patriot Prime, Sarelle, and Kuzar Secondus.
Monolynths are seen across all galaxies that had native species at the time of the Alliance. Scientists believe that they are waypoints of some kind for certain species, since certain Monolynths are only able to be inhabited by certain species.