Death may Die
The Cenozoic Era includes modern human history, but for history after the current real-world date, see the history of arcane sciences and the excessionist threat, the history of modern space exploration and the interplanetary war, and the history of the oceanic war, Rali cults, and the Raliite problem.
It would appear, based on the pictorial records at Kadeth, that by this time the Old Ones had lost all hold on the Earth other than in the Antarctic, and the lack of any aquatic depiction from the Paleogene onward indicates that their hold didn’t even reach so far as the sea. By this tame, the Old Ones had no access to their preferred aquatic habitats.
It also appears that they’d lost all grasp of their biological sciences, and had regressed to a much more primitive state. Although clearly possessed of technologies beyond our own, they may not have fully understood those technologies. It also appears that it was lopsided. Some of their technologies were well advanced, while others were horrendously backward.
This took away the last vertebrae of what had been the backbone of terrestrial ecology. This had some severe consequences to life on Earth.
One item isn’t well noted in the pictorial record, but as of the Paleogene and into the Neogene, there are no fewer than three depictions of [ Wraiths. Since the Great Race were the wardens for the Wraiths in their final habitats, one could presume that the Great Race lost hold of them. No further depictions of the Great Race occurs, which means they likely went extinct. The exact nature of that extinction is unclear, thanks to uncertainties regarding the nature of the Great Race.
The pictorial record of Kadeth becomes scant around this time. It seems that the population of the Old Ones was dwindling. At some point during this time, it appears they completely died out. The stones used to construct Kadeth came from multiple eras, but no earlier than the Santonean Age of the Cretaceous Period and no later than the Burdigalian Age of the Neogene Period.
Reports indicate a probable reason being the final loss of control of the industrial biocomputers. The learned reflexes of these massive biocomputers became so sophisticated and diverse that even the precise hypnogogic controls could no longer distinguish commands. They grew out of control and struck at the Old Ones. Left without any infrastructure, unable to survive within their own city, and with no other safe habitat, they either perished by creature or perished by exposure, or perhaps they couldn’t keep young alive and perished of senescence.
This, ironically, means we have less information about the last 20 million years than we have about the 200 million years before it.
At around this time, the myriad breeds of prehumans, including Cro-Magnon (the so-called “anatomically modern human”), Neanderthals, Denisovans, and at least three other hominins about which we know little or nothing, all interbred to form the various breeds of anatomically modern humans. Indeed, these weren’t separate species at all but ethnic divisions, in the same way that different breeds of dog can be incredibly different but still the same species.
Around 50,000 BCE, behaviorally modern humans came into being. The most intelligent theories thus far have proposed that this was something of a critical population and development threshold, where humans had both numbers and opportunity to develop cultural identity and cultural unity. Human cultural intelligence begins from this point, and has been expanding ever since.
The SFS retain their hold on the solar system, and now come to the Earth for materials and to investigate the life on the planet. It isn’t entirely clear why, but approximately 32,000 years ago they interdicted on human development. The intent isn’t clear, but the result is clear enough. Every human being they found with arcane biology was slain.
This affected a small portion of the population, but since the features are largely dominant in human genetics it meant that humanity would not have gained arcane capabilities. Indeed, they never should have, and arcane biology should never have developed so significantly as it did.
Their own explanation as to why is indistinct. Apparently, they accuse excession for our own development of behavioral modernity and for the widespread nature of human arcane biology. It doesn’t seem to have helped much, though. At some point subsequent to that, it became a principle genetic feature across most of human life. The exact process of how this happened is unknown. See the history of arcane sciences for more information.