The simulation experiments with the Calamity Star were used to deepen one's understanding and mastery over Oblivion.
As for the location of the experiments, Lilith had specifically partitioned it off. When Oblivion and the Calamity Star clashed, it inevitably impacted the environment. According to the records in the Virtual World Core, when Zheng Yichen struck the Calamity Star, it plunged the entire Virtual World into darkness.
In more professional terms, it could be described as rippling across the Three Realms.
The tests here were much the same. Even though the area was independently separated, the constructed Virtual World would still be influenced—day would turn into night, and night would grow darker still.
As for simulating the Calamity Star for testing, it was rather easy to produce. Lilith wouldn't divert a massive amount of permissions away from the Virtual World Core; she had other support methods.
