"Another world?"
The first kind of situation the System mentioned was easy for William to understand without any explanation, but this second kind left him rather baffled.
He continued asking, "What do you mean by another world? Tell me about it."
Yes. For example, the anomaly known as The Thing, which was encountered by the host's agents, Li Mu and Rebecca Chambers. The Reaper Civilization encountered by the host also came from an anomaly in 'another world.'
"Wait..." After hearing the System's words, William became even more confused. "I have no questions if you're saying the Reaper Civilization came from another world.
"But after examining the ship The Thing used, it was found to have existed on Earth in this world for at least a hundred thousand years. Doesn't that mean it was originally an anomaly that already existed here?"
``` In response to the host: No.
There are also examples of anomalies that originated in this world, such as the Nemean Lion and Hydra contained by the host, as well as Athena and the brain-dead Achilles.
Because human society, history, and mythology in this world are similar to those of the host's original world.
Therefore, these are all anomalies native to this world. They have existed here from beginning to end and were not randomly generated.
So-called anomalies from 'another world' are anomalies that originated in their own worlds but intruded into this one.
Take the 'The Thing' the host just asked about. It actually came from the world of the film The Thing. No matter how many years it has spent in this world, it is ultimately an alien species.
Or consider the Ghidorah tamed by Cronus, as well as Godzilla and the other giant beasts. They should originally have existed in the world of Godzilla.