medusa was supposedly one of aphroditie's children. she was so beautiful that she could make anything stare in awe. posiden saw her and said she was more beautiful than all the seas. so he changed himself and asked her to meet him in a temple. since he and athena had been in bad terms for many years he choose athenas temple just to make her mad. and athena saw what they were doing in her temple she was very angry. since gods can't steal another gods powers or turn them into something (unless by the river styx but thats a different story) she decided to curse posiden in another way. he would never be able to see his beloved medusa. so athena cursed medusa with snakes as hair and skin of scales, she would have no more legs but have a snakes tail, she would be imortal so that if ever looked at by anyone man or woman they would forever become stone even if she was killed. (gods in greek myths can be killed its just extreamly hard since medusa wasn't a god it would be easy for perseus to eventually kill her, but she would eventually grow another head so that her curse could go on.) posiden was so angry at athena they have never been friends. medusa when she realized this happened she became furrius and posiden so she said if she ever smelt his blood she would turn him to stone forever. (in that state the god would still be alive just not able to move or speak