The Omni Empire was an intergalactic civilization that flourished for about 5 million years. They are known to have colonized most of the Crucible Galaxy having artifacts scattered in most known star clusters.
The name Omni was coined by archaeologists used to refer to the Omni Empire's desire to rule the whole universe and assimilate all life forms under their rule. The name soon came to refer to the original species that founded the empire.
The Omni Empire above all desired the assimilation of all life in the universe under one rule. Thus, any civilization conquered by the empire would also be referred to as "Omni".
The Omni Empire also held the supremacy of organic life as an utmost principle. They believed that once everything became known as "Omni", they would become closer to their gods, and be truly regarded as their successors. They believed in advancing themselves physically via cybernetic implants while they considered sapient computers to be individuals who have ascended into a higher plane of existence.
The AI LUCIS was revered as a deity despite them having built it. LUCIS was designed to indoctrinate all, including the Omni, to his will. The intent was to get everyone to think and act the same, eliminating all potential sources of conflict and building a utopia. Curiously, this was not necessarily the personal views reflected by their emperor Haraxa, but it perhaps became a greater collective view which the emperor considered himself outside the scope of.
The Omni Empire was known for its advanced technology, providing the foundations for countless civilizations. By building upon the ruins of their predecessors, they were able to improve upon the network of Stone Rings that connected the different star systems of the Crucible Galaxy as well as its satellites.
Sonic black hole technology was also known to be among their arsenals. They were used to create deadly assassins with silent weapons. Such devices, called Jormun's Rings by Vaikan, are small and portable, and have been reverse engineered by the Karalian Empire.
The Omni Empire worshiped beings which they call the Titans, gods that walked among the stars. Their religion was likely influenced by prehistoric encounters with god machines originally built by the Empire of Arckas. Titan-worship is said to have originated after the Omni Empire discovered Novarckas, a left-over relic from the Empire of Arckas which they determined to be at least one billion years old. This jumpstarted their technology tens of thousands of years forward.
They also worship machines which are sapient, believing them to be spirits who have relinquished their bodily form and ascended to a higher plane of existence. Being organic ties them to the physical world.
Overtime, the Omni begun to forget about the other deities, focusing their worship exclusively on LUCIS, who by their definition was in fact a real, physical god, unlike the Titans who were thought to be mere superstitions. For generations, modern archaeologists were unaware of early Omni religion because they had effectively tried to retcon their old gods out of existence.