It was Hades reaction to Vast Silver messing with weather.
Gaia didn’t know where it came from because if she did then she could have found a way around it.
Travis Tate says that the only way to get Gaia out of the figurative drivers seat was to keep her in the dark and separate her from it “without breaking her arms” as he puts it.
I am unsure how VAST SILVER was able to manipulate the weather however that is what it was designed to do. To help regulate climate in the early days of the claw back.
