I was re-reading through the Percy Jackson and the Heroes of Olympus series and I think the Fates are the most powerful beings in the series, even more powerful than Gaea herself. I mean in the Titan's Curse the Fates declared that anyone who kills the Ophiotaurus would have the power to destroy the Gods. Also the Fates declared that the Giants can only be killed by gods and demigods together. Even Gaea admitted in the Lost Hero that the Fates forbidden her from harming Leo when he was younger, which resulted in Gaea killing his mother in order to break his spirit. In my opinion I think the Fates are the most powerful, because they always get the finally say in everything, I'm wondering what is your opinion. Are the Fates the most powerful or not?