This is a question that I’ve been questioning for quite a while now. ***I highly recommend reading what’s below if you haven’t read the Harry Potter series, the Percy Jackson series and the Heroes of Olympus series, or both*** -|-Harry Potter series-|- Wizards and witches are taught by the professors in Hogwarts, the school for all wizards and witches [both wizards and witches aren’t evil, but there are a few cases where they are evil]. They cast spells with their wands to either help themselves or to worsen others’ status. Although Abracadabra [the killing spell] could be used in this battle, they aren’t permitted unless someone wants to break the rules that the Ministry of Magic has made. -|-Demigods / Percy Jackson series / Heroes of Olympus series-|- There are two safe havens in the world that Rick Riordan created : Camp Half-Blood and Camp Jupiter. Camp Half-Blood houses Greek demigods, which mean anyone who has half-Greek-god blood and half-human blood. Camp Jupiter usually houses Roman demigods, which means anyone who has half-Roman-god blood and half-human blood. There are a few instances when Romans have been to Camp Half-Blood or when Greeks have been to Camp Jupiter. Anyways, greek fire is a weapon used by many Greek demigods because of its highly flammable status. Both Greeks and Romans use weapons. Weapons may vary from arrow to spear, from sword to dagger.