Now that you mention that, I do feel like I remember that...
I do wonder what Athena's beef is with Asterion. *Puns*
I think I remember Athena hating Poseidon???
It was stated in the transcripts of the trial by multiple gods that Athena has been zealously wiping out Poseidon's entire bloodlines. I think it's because he keeps leaving demigods all over the place.
