<P> Sometime in the distant past, God dictated the angel scribe Metatron to write a compendium of tablets known as the Word of God . They cover a variety of subjects, including demons, angels, and leviathans . God then sealed the tablets inside the "Vault of the Earth" and even if someone were to find them, only a few chosen humans, the prophets, are able to decipher them . The Leviathan Tablet, which was dug from somewhere in Iran, has an instruction regarding how to kill a leviathan . The Demon Tablet, recovered by Crowley through unknown means, contains an instruction about locking all demons in Hell forever as well as techniques about disposing demons, such as devil's traps, holy water, and demon bombs . The Angel Tablet, stored in one of Lucifer's crypts, has the information on how to make all angels fall from Heaven as well as an incantation to imbue an angel with great power . The Demon Tablet is currently in the possession of Castiel, who has destroyed the Angel Tablet in the ninth season to prevent Metatron from using its powers . </P> <P> After God and the archangels successfully battled the Darkness to submission at the beginning of creation, God sealed the latter inside a metaphysical cage, whose seal was handed over to Lucifer for safekeeping . However, the Darkness' influence was as such that Lucifer was corrupted by it, eventually becoming the first fallen angel after refusing to honor humans . Lucifer then offered the seal to Cain, which empowered a blade made from the jawbone of a donkey that he used to kill and send his brother, Abel, to Heaven . Whenceforth, the seal was known by the moniker of the Mark of Cain, while the blade was dubbed the First Blade . Wielders of the Mark are corrupted by the Darkness so they would have the lust for power and bloodbath . This power in turn activates the First Blade, otherwise useless when wielded by other people, to become an invincible weapon capable of killing everything, even angels and higher demons . If killed, wielders of the Mark are resurrected as demons, as shown by Dean in the finale of the ninth season . At the start of the series, Cain had thrown the First Blade to the bottom of the Marianas Trench, only to take it back and give it as well as the Mark to Dean as part of the latter's quest to kill Abaddon . However, this gives Dean the attendant problems of the Mark, which slowly corrupts him, as releasing the Mark requires an arduous ritual, and if not transferred to someone else would release the Darkness from her cage . </P> <P> The advertisements The WB chose for the show went beyond just commercials and billboards . Before the series debuted, the network placed signs for the show at gas station pumps, and gave out rubber glow - in - the - dark bracelets at New York and Los Angeles movie theaters . Also, coffee cup sleeves revealed the image of a "terrified woman seemingly pinned to a ceiling" when heated were distributed to 500 cafes throughout New York, Chicago, and Los Angeles . The same image was used in special mirrors the network installed in almost 200 nightclubs throughout three cities in order to reach "young, hip horror fans". Additional advertisements were also placed in bars, movie theaters, and video game stores, with hundreds of the bars also receiving Supernatural napkins and coasters . </P> <P> The series also has many real - life tie - ins . The urban legend website Hellhounds Lair featured in the season one episode "Hell House" was a real website set up by the show's producers . As a tie - in to the sequel episode "Ghostfacers", in which the owners of Hellhounds Lair create their own Ghost Hunters - style reality show, The CW set up Ghostfacers.com . The Winchesters later visit this website in the fourth - season episode "It's a Terrible Life". Series tie - ins, however, extend beyond the internet . For a time, Dean's cell number--revealed in the first - season episode "Phantom Traveler" to be 1--866--907--3235--was a real number, with Jensen Ackles reading the message: "This is Dean Winchester . If this is an emergency, leave a message . If you are calling about 11--2--83, page me with your coordinates ." The second - season episode "Tall Tales" featured a tie - in to that week's issue of the tabloid newspaper Weekly World News . The February 19 and March 19, 2007, editions of the paper featured exclusive interviews with Sam and Dean, the articles being written by Paul Kupperberg . </P>

Supernatural is the only thing keeping this country