As said before, Medsua’s head is a nuclear weapon. It’s probably a 100 megaton warhead in an MX where every roll is a 10 and a shroom 6. For those who play Nuclear War, you know what I’m talking about. And for those who don’t, what are you waiting for?
This thing has amazing range, no need for ammunition, will never harm the person using it (Perseus), and there’s no practical defense against it. If Perseus shows up at your door with Medusa’s head, you’re in serious trouble. Just strike a pose and get comfortable with the fact that you’ll be a statue. Hopefully it won’t be like John Crichton who was conscious the entire time. What do you mean you don’t understand Farscape references?
So how does this stack up in the Ancient World? Zeus’s thunderbolt is the clear benchmark for WMDs. Does Medusa’s head win? No, just because a thunderbolt has an unbelievable range. Artemis’s or Apollo’s bow? Medusa’s head wins. Poseidon’s trident? Well, for all of Pirates of the Caribbean, Poseidon’s trident doesn’t seem to have any special powers that mark it out from an ordinary trident, so Medusa’s head. In fact, I’d be willing to say that Medusa’s head beats out just about everything on Olympus except for the thunderbolt.
And it’s in the hands of a mortal.
This sounds like an insane idea. In fact, just putting Medusa on the planet sounds like an insane idea. She could’ve easily destroyed all of humanity. Even with her dead, Perseus could make that happen. Fortunately, Perseus was not motivated by greed or to grab power, but to defend his Mom, so there’s a chance that he will use it responsibly. Well, as responsible as anyone can wield a nuclear weapon, I guess.
But in thinking about this, I’m beginning to form a new theory regarding the Greek gods and the heroes. It’s still in its infancy, but it might give a secondary reason as to why Zeus was so intent on bringing heroes into the world. Need to mull it over for a bit.