Immortal Cultivation System in Another World

On this day in 5020, everyone was doing their own thing. Several portals appeared from nowhere and stood all over the world. Suddenly, the portals glowed purple with lightning, and large monsters came out of them, causing wanton destruction everywhere. In an instant, objects near the portals were destroyed in an instant. All countries sent all their combat forces to attack these monsters. After three days, it was discovered that these monsters were not very powerful in combat, and were beaten back by the combat power of various countries. Then a 2-meter-tall vampire-like monster with six wings on its back came out and said: These are just low-level monsters we sent to test the combat power of your world; I can imagine that you are just average. Just wait for my next attack. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.