Ok, after a while of thinking about it, i've realised that some aspects of the Romanum 01 universe haven't taken into account some minor or even major details. Such details include Religion, Politics, Law and Order, Science and so on. All of these are bound to have changed due to the temporal inccursion (Nevuchavazin finding the Nexus). I'll list out some issues I have noticed in due course.
Here are my own suggestions to resolve the issues. For starters:
Religions. Christianity's spread to the Roman Empire would not have been easy, considering Israel was and is still part of Xanjon in this timeline. While it would not have been oppressed, Christ would probably not have gained as much recognition, without the martyr status. It's spread would not have been impossible, rather it might have gotten to Rome sooner. Islam, of course, would never have risen or not as we know it today.
Egypt. Shortly after the first recorded instance of the Nexus appearing there, Egypt came under new leadership from the "Children of the Great Star", worshiping the Nexus as Ra's embodiment on Earth. When they discovered the Xanj had an affinity with this holy apparition, they decided to adopt Xanjin philosophy to try and gain understanding of the Nexus. In doing this, they became Hydronia and began reforms, such as abolishment of slavery. Of course, seen as religious oppression in the Arabic peninsula was abolished or at least frowned upon, Hebrews would of had it easier. But anyway, after Hydronia fell due to economic issues, Rome bought it out, and then it was conquered by Greece.
Inventions of the 18th and 19th centuries. I've already stated that we have advanced A.I. as far back as the 1930s, and that the moon landing happened about a hundred years before real life's one. My solution: Rome not falling, plus Xanjon's added tech benefaction (from the Nexus aswell as a good 1,5 thousand years head start over of Rome) resulted in many inventions, such as firearms and other technology of the Industrial revolution, being moved back to about the 5th century.
Cryptids and out-of-place creatures. Same as Xanjon has a form of omnivorous, digitigrade repto-cammels, we also have Terrorbirds. The former has existed for a few thousand years at the time Xanjin discovered Genetic engineering, so where did it come from? The Nexus! It IS after all a trans-universal portal, so these things probably came from another universe, imported or stolen. Most Cryptids could be explained the same way, but to avoid sounding lazy, we should probably redefine some of them to be more realistic and plausible, such as bigfoot being a type of erectile gorilla that was never wiped out by Roman settlers in America.