Ok.
This is REALLY fucked up.
People were always bitching about how you CANNOT slay or kill a god.
I'm not going to rant about how they are so wrong, but in the first game it made sense because he'd found Pandora's Box.
Athena mentioned it was the only weapon that could KILL a god.
So how is it that Kratos was about to kill Zeus in the end?
I figured that it wasn't an instant kill, because he had to keep stabbing Zeus with the blade before Athena stepped in.
I don't remember them saying that the Blade can kill gods.