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"You created Medusa?" Asked Dean. This day just got weirder and weirder. Okay, all Greek gods were real. Hercules was real. Demon-bird creatures were real. Zeus was a douchebag. Medusa was created by Athena who is the goddess of war but is helpful. Weirder and weirder.
"There was once a young woman named Medusa." Prometheus said before Athena answered. "She was very beautiful, and very vain. One day, when she was twenty-four she looked into her mirror and said 'Why, with my face and hair, I'm more beautiful than even the goddess Athena'."
"In those days I had many worshipers. That was something you just didn't SAY." Athena said, sitting. "I was vain and she pissed me off, so I turned her into something terrible. A monster." She bit her lip and Sam knew she regretted losing her temper.
Prometheus continued for her. "Athena turned her face into something so hideous it turned people to stone if they saw it, and she turned her hair into a mass of writhing snakes. The girl fled, turning everyone who saw her on the way to stone."
Athena sighed. "For several years she was more depressed than anything else. But then she became mad and now she's turning everyone who goes near her into stone."
"Why don't you just kill her?" Asked Sam.
"I have my reasons." Athena said mysteriously. "So, you kill her, preferably without getting turned to stone, and I heal Castiel. Deal?"
There was a pause. "Fine." Dean said. "Where is she?"
"She's in a cave not far from here." Athena pointed down into the forest. "Down there along the cliff side. You'll know when you reach the right cave."
"How?"
"It will have many stone statues of unlucky people and animals outside it."
"I had to ask."
After Dean and Sam left Prometheus turned to Athena. "What will you do with me now, sister?"
"Stay hidden again until I call for you. We have work to do, and the brothers... I will recruit them. But I need others as well. I'm going to talk to Hercules, Pandora... and of course the angel. He is powerful. We'll need him too."
"My goddess!" Pandora said, kneeling at Athena's feet.
"Hello Pandora." Athena said, bringing her back up and giving her a brief hug. "How have you been?"
"I'm fine. But why are you down on Earth? Why aren't you on Mount Olympus with Zeus?" She asked.
"That's... to save the problem of repeating myself, you'll find out later. Safe to say," She said turning to Castiel who was watching them with his one good eye, "Heaven's not the only holy area that is in disarray." She healed the angel. "Now don't go popping off for Dean and Sam. Do so and I will kill you. Sorry, but they're on a mission for me, and I only sent them so they can prove themselves worthy."
"Worthy for what?"
"Like I said, you'll find out soon enough." She unexpectedly hugged Castiel, who was more than a little uncomfortable with it. "You aren't part of the upcoming deal however. I know I can get the brother's to help out, but there is little I can offer you. I can't go into Heaven, so I am no use in helping out with your war. There is nothing I can offer you for your help. So I'm asking nicely instead. Little nephew, will you help me? Please?" She and Castiel sat eye-to-eye, and he saw no deceit hidden in hers, no madness. He didn't like the Greek gods, didn't trust them, but she was asking, something Greek gods rarely did. No, more often they demanded. However, Athena always was different...
"Alright." He answered. "I will help, but only to be there if the Winchester brothers need me. May I know with what though?"
Athena nodded. "Alright. Listen." And she told them the state of Mount Olympus, much to Pandora's absolute horror.
Athena calls Castiel 'My little nephew'. This is probably actually true. I assume all gods in Supernatural are siblings (or at least related), but of different power, so God is Athena's (brother?). That would make Castiel her nephew.