Just as mentioned before, Fang Zheng doesn't need Valentine to investigate what those cultists are trying to do. In fact, he can more or less guess. March, earthquakes, storms, frequent riots everywhere are all signs of Cthulhu awakening.
When the stars align, R'lyeh will rise from the sea, and the great Cthulhu will awaken.
In the original work, Cthulhu didn't fully awaken. Strictly speaking, what collided at that time was merely a projection of Cthulhu. Originally, a mysterious ritual should have been conducted to fully awaken, but because the ritual was interrupted, it reverted to its form.
If you use the Main World to describe it, it's like a third-rate mage trying to summon the Demon King of Hell using a summoning technique, but getting interrupted just as he starts, causing the Demon King to not be able to show his power in the Main Dimension.
Rather than the heroes being exceptionally powerful, who broke the magic circle and defeated the summoner.
