The things of this universe born or begins to exist, grows and advances, and in the process creating and destroying in miriad of interactions, and then after a while soon or later such things has to end, it is inevitable, it is a tendency that is natural in the great schemes of things, it may come in a time, but in the end it is sure that the end always happen to everything that has been born in this great cosmos, which also include the intelligent species, those creatures that with great skills to invent and study their environment around and to be able to create the tools to survive, eventually can not avoid the inevitable end.
That's what happened to the first great civilization of the last billion years, the Brizionians when their almost 300 million year old empire collapsed due to their inability to maintain balance, and from there they perished to make way for the next great dynasty, one that would prosper for a long period of time. This started when their practice of destruction to limit the rise of intelligent life caused more harm that good, driving its own kind to start a civil war which lasted millions of years, and eventually leaving what we would call it a blind spot in a region where their presence was almost non-existent, in that place was a planet, the fourth to orbit a yellow star, the world called by its original inhabitants as Orolis, a temperate planet similar in size to the earth, this world had remained practically intact from the practices of the Ancient Empire for many millions of years and despite remaining a candidate for extermination, unnoticed and with the absence of the race now occupied in a war this world would host a new intelligent species, from a forgotten corner of a now chaotic galaxy the Clorns emerged.
These titans of 4 meters tall had started as the most intelligent species of a clade of huge omnivores coming from a great dinasty of arthropodal megafauna organisms that have been dominating Orolis for the last 100 million years. they were originally arthropodic octopodal centauroids, with a pair of legs adapted originally for defense being able to hit with quite extreme force, eventually developed hand manipulating organs with 4 appendages similar to fingers and special bristles for touch and smell, and the rest of the 6 limbs just used to walk being pillar shaped, semi-erect with 3 scute like toes. Its body was segmented in 4 parts that corresponded to its limb number, being the frontal section elongated with space to fold the main arms when did not use them, and from this it hold the large and protuberant head being half of their height, with 3 pairs of compound eyes that protruded from a single eyestalk on each side, a small mouth formed by 3 beak like mouthparts covered by 2 pairs of mouthparts, and a prominent forehead which actually holds part of its digestive system and some other organs, being the brain located across the neck and part of the first segment of its body. Despite their insectoid appearance with what looks like an exoskeleton, that just only a impresion of its old ancestral shape armour that It has thinned and covered by the tissue, while inside their body is supported by a fairly developed endoskeleton that allows to support the body.
The Clorn kind started on a large continent, in the midst of the low vegetation areas, being mostly a savannah environment, they eventually moved to temperate rainforests where they had started to develop their own agriculture and societies, to eventually climb into advanced cultural and technological development in about 20,000 years later, arriving in space and colonizing other celestial bodies, and doing the final jump to other solar systems in a period of 2000 years, creating a federation formed of different colonies that would prosper for several thousand years, expanding in the galactic arm in rather slowly step even though they eventually invented a rudimentary type of hyper-luminic contact and transport.
Unfortunately, their prosperity ended when they came into contact with the still-in-conflict Brizionians, who in a hasty manner with a reinforced xenophobia had embedded themselves in the extermination of the Clorn, devastating a large part of the colonized worlds. Although the Clorns already had an idea of the existence of the Brizionians and their empire by series of abandoned worlds ruins and of certain leaks of communications from these, they never had an idea at the beginning of the fulminating force they had, an ancient empire which was able to overcome the very young folk. The battle in spite of being unbalanced by the technological level and antiquity of each civilization, there were several advantages of which allowed the Clorns to elude and confront with enough resistance to the invasive force, including an empire fractured by a war, its great capacity to apply some technology in reverse and the brizionian ignorance of the territory dominated by the arthropod titans.
For at least other 10 million years there was formed many war fronts from many folks of the Brizionians which wanted to end or continue the empire, even though all of them wanted the Clorns to become extinct, the Clorns endure in constant resilience, which eventually just ended in a cold war in a galactic scale, but everything started falling apart with few of the factions of the brizionians overcame their xenophobia considering the state of stagnation of their clade, helping the Clorns to give the right push by giving them total knowledge, strategy and technology that would put them at the level of the old empire, eventually by world and world the Clorns overthrew the old empire to the ground, eventually while those who helped them chose the exile. With the Brizionians out and that war finished once for all around 810 millions of years ago, the clorns started to build up a new galactic civilization from the ashes and destruction, giving rise to an era of flourishing of life and diversity, with new and varied civilizations emerging in other regions of space from many new species, in addition to several others created by the Clorns themselves, creating a galactic republic of united civilizations, creating and building worlds and artificial mega structures, modifying at the same time in its own anatomy and contacting other extragalactic races, even though they still confronted calamities and even conflicts in different scales, their kind and civlizations alongside them mantained a good balance and kept this large Union for at least 340 million years, but eventually just like the previous Empire, this union was going to end.
The Clorns with their great Galactic Republic they founded and being watched by them in a point around 490 to 470 millions of years ago ended abruptly by a series of major cataclismic events still unknown for humans that wiped out great part of the life in millions of worlds, and many of the civilizations that cohabited not only in this but in the other neighboring galaxies, something that this race couldn't control or stop. Interestingly, it seems that a remnant of these survived and maintained a little activity millions of years after the fall of their galactic civilization in some worlds, but eventually they disappeared without a trace.
In this universe many things born, live and dies, in an always constant process that repeats in each species, in each event, in each object, neither the Brizionians, neither Clorns escaped it, but with the ending it doesn't mean a total termination, but just a conclusion of a chapter, as with the Clorns gone new races and civilizations emerged, eventually including humanity itself, as just a process in the great scheme of things on this universe.