A day had passed, and the emperor's family was now departing because they were finished extracting the land's resources, and will wait for it to heal itself again to do the same thing over and over again, while not noticing the egg, which was already too obvious due to its colossal stature of 900 million meters, and that was only the first day.
Huge beady eyes with slimy and thorny slug-like things swirling inside them staring with the most sickening and disgusting bloodlust implying that they will die soon so they must wait patiently like the shitbags they are. After a few months, the emperor's family had almost finished preparing for the invasion; they had armored 100 quadrillion of the human-beast hybrids and armed them with swords and spears controlled by their newfound power to forcefully control their souls, a method similar to Soul Bind.
It was called Soul Authority, and it was the ability to manipulate and completely subdue a person's entire soul and have complete command over it. It also has the ability to completely make any bodily feelings disappear by will of the wielder of Soul Authority, such as pain, happiness, or sadness, or even all feelings depending on the person who wields this power. The emperor's family, on the other hand, wanted them to feel more pain, more rage, and removed everything else, which caused the smallest humanity left in these human-hybrid monsters to vanish.
The human-hybrids' already monstrous nature and unbalanced sanity, inhumane craving for blood and violence, and Soul Authority on top of all that made them stronger and more aggressive than before, raising their cultivation stage comparable to a 1st rate cultivator before to a venerable stage cultivator, with only one of them slaughtering 100,000 1st rate martial artists with ease.
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These human-hybrids can also steal the Qi attributes of any person, thing, or animal they consume, which is now considered a forbidden martial arts technique but was previously dismissed as demonic arts. Little did they know that viewing this so-called life steal art as a simple "demonic" technique would wipe out everyone who came across it.
The emperor's family would gradually brainwash these 100 quadrillion human-hybrid slaves to the point where they had a hive mind mentality, implying that if the emperor's family fell and died, they would all perish, The constraints and seals placed by them would be lifted, and all 100 quadrillion of these human-hybrids would be free to wreak havoc and commit genocide as much as their hearts desired, it was a rather stupid system to control these rabid monsters, no, these hybrids surpassed logic, calling them monsters would be like calling human shit smelly mud, it was ridiculous.
As much as I pity them, these hybrids have sunk so low that they can instinctively reproduce and produce more of them, what they can give birth to is up to the species, and the babies they give birth to are the ugliest incarnations no man has ever seen, I doubt you could last a minute without vomiting at the sight of them, and these hybrids not only reproduce, but they mate really fast and give birth twice as fast as well, laying eggs waiting for them to hatch.