Tablets
History
The Word of God was inscribed on a series of tablets that were dictated by God during creation "for the defense of mankind". They were transcribed by the archangel Metatron, and can only be read by a prophet.
Castiel says that if the Word of God is revealed a prophet will be awakened and that angel protocol dictates that the prophet be taken to a desert to learn the Word.
The first tablet in the series was excavated by Dick Roman in Iran and describes how to kill the Leviathan. The second tablet was in the hands of Crowley and Kevin Tran, and is titled 'Demons'. It includes instructions on how to construct a weapon against demons, and also how to seal the gates of Hell and information on how to see hellhounds.
It is revealed that there is an angel tablet and that the angels fear it falling into the hands of demons as it could cause great harm to them.
Leviathan Tablet
7.20 The Girl with the Dungeons and Dragons Tattoo
Charlie Bradbury an IT specialist who works for Dick Roman, is helping Sam and Dean retrieve Frank Devereaux's hard drive from Dick, and hack into his emails.
Charlie manages to get into Dick's office and download his emails. Back at her desk she sends these, along with the contents of Frank's hard drive to the boys. She discovers that a package for Dick is arriving from an archeological dig in Iran at a nearby airport and manages to send a fake email, so it appears to be arriving 30 minutes later. This allows Sam and Dean time to get to the airport and switch the package for a case with a borax bomb in it.
When they open the case they find it contains a slab of rock.
7.21 Reading Is Fundamental
Dean cracks the stone containing the tablet. As he does so there are electrical storms, women go into labour, Kevin Tran becomes a Prophet, and Castiel wakes from his comatose state. What can be read from the translation is of the following:
"Cut off the head, and the body will flounder. Waste not thy time nor your breath upon the Leviathan herd. Point thy blade at the heart of their master, for from him springs all their messages. Leviathan cannot be slain but by a bone of a righteous mortal, as light and good as the Leviathan are hungry and dark, washed in the three bloods of the fallen: a fallen angel, the ruler of fallen humanity, and the father of fallen beasts."
Sam and Dean decide to start gathering the needed parts of the weapon and start by getting the fallen angel blood from Castiel. When Kevin returns home and is captured by Edgar, he still has the tablet and it is captured with him.
7.22 There Will Be Blood
After having captured Kevin Tran, Dick Roman forces him to translate the tablet for him. After the translation is done, Dick sends out Edgar to kill the Alpha Vampire and get his blood and summons Crowley into a Devil's Trap to make a deal with him.
At the same time, Bobby Singer figures out that the Ruler of Fallen Humanity is Crowley and that for a Father of Fallen Beasts they need an Alpha. Crowley is summoned and promises them his blood once they get the other needed pieces. Sam and Dean are able to get the Alpha Vampire to give them his blood after they save him from Edgar and prove that the Leviathans have betrayed him.
7.23 Survival of the Fittest
Sam and Dean steal the bone of a nun, Sister Mary Constant to get the "bone of a righteous mortal" while Dick makes a deal with Crowley to have him give them the wrong blood. However, Crowley informs them of the deal and gives them the right blood and they are able to make the weapon the tablet describes. Dean is later able to use it to kill Dick Roman with the help of Castiel.
Demon Tablet
8.01 We Need to Talk About Kevin
After Crowley captures Kevin, he takes him to a warehouse where he shows him another Word of God tablet, this time about demons and has him translate it for him. Kevin learns it reveals how to throw open the gates to Hell and let demons out onto the Earth and directs him to one in Wisconsin while he performs a spell from the tablet to open it. However, Kevin casts another spell, this one from a section on how to kill demons and kills two demons holding him prisoner and escapes. Kevin hides the tablet somewhere, but learns how to protect himself from demons from it and that there's also a way to close the gates of Hell forever and banish all demons from the Earth.
8.02 What's Up, Tiger Mommy?
After being stolen from the bus station where it was kept, Sam and Dean track it to a pawn shop where it was sold to Beau. The tablet is then sold at an auction run by the God of Greed Plutus. Sam, Dean, Kevin and Linda Tran team up to recover it while Crowley and the angel Samandiriel also try to get it. When the bid doesn't get high enough, Plutus tries to sell Kevin as well. Eventually Mrs. Tran bids her soul and the tablet is sold to her, Sam and Dean. However, Crowley possesses Mrs. Tran and teams up with Beau to betray and kill Plutus. In the fight that follows, Crowley, who learns of Sam and Dean's plan to close the gates of Hell forever, gets his hands on the tablet and escapes with it.
8.07 A Little Slice of Kevin
In a desperate attempt to translate the tablet, Crowley abducts all future Prophets, but none of them possess the capability to read it until Kevin dies.
Linda Tran comes up with a plan to strike back against Crowley by hiring a witch named Delta Mendota to gather the ingredients they need for the "demon bomb" spell Kevin used to escape Crowley's henchmen which are scattered all over the world. Delta brings them enough ingredients for at least one demon bomb, but betrays them to Crowley who kidnaps Kevin and leaves a demon to kill Linda. However, Linda captures the demon and takes him to Sam and Dean along with the ingredients and Kevin's notebook containing the information on how to create the bomb.
Crowley, even though he has all of the future prophets, prefers that Kevin translate the tablet for him rather than him kill Kevin and get one of the others to do it. After Crowley cuts off one of Kevin's fingers, he agrees. Kevin reads the titles of the various sections to Crowley which include the section on how to kill demons and how to seal the gates of Hell. However, Kevin also finds a note from Metatron, the writer of the tablet stating that after he writes it, he plans to take his leave of God and his brethren and leave the tablets for humanity, revealing that there is a compendium of tablets, interesting Crowley with the fact that there are tablets on more things than demons and Leviathans.
Sam, Dean and Castiel launch an attack on Crowley's warehouse to rescue the prophets and retrieve the tablet. During the rescue, Sam uses a demon bomb to kill three demons. Castiel confronts Crowley across a table that holds the tablet and when Castiel starts to use his powers on him, Crowley tries to grab the tablet and flee, but Castiel breaks it in half, leaving the escaped Crowley with one half and the Winchesters with the other. Sam and Dean decide to set out and find the remaining half of the tablet and Castiel chooses to join them.
8.10 Torn and Frayed
Needing to deal with a lot of demons guarding the captive angel Samandiriel, Dean and Castiel travel to Kevin to get the ingredients for the demon bomb which they are out of. Kevin, who is trying in vain to translate the half of the tablet he has, is annoyed with them and reveals how difficult just the first three ingredients would be to get, however, Castiel asks for a list and heads off to get them. Kevin is shown to be running himself into the ground trying to translate the tablet and is very disheveled.
When being tortured, Samandiriel brings up the tablets, which is apparently hardwired into all angels and specifically the demon tablet which Crowley is uninterested in as he already knows about it.
Castiel is able to get the needed ingredients and during the assault on Crowley's headquarters, Sam and Dean are able to kill four demons with the demon bomb, killing two each with a bomb they each threw.
8.14 Trial and Error
After weeks of non-stop work, Kevin finally manages to translate the part of the tablet about closing the gates of Hell. According to Kevin, the tablet reveals that someone must do three trials and read an Enochian spell after each one. Kevin translates it as "whosoever chooses to undertake these tasks should fear not danger nor death nor getting your spine ripped out through your mouth for all eternity." Once the three tests are done, the gates can be closed. Kevin is only able to crack the first test which is to kill a hellhound and bathe in its blood. Sam and Dean set out to kill a hellhound by looking for someone who has made a deal which is to come due soon.
Later, Kevin finds information on hellhounds and calls Dean to tell him about it, telling him it reads "the dire creatures may be seen only by the damned or through an object scorched with Holy Fire." Using this information, Sam and Dean come up with the idea to use glasses scorched by Holy Fire to see the hellhound.
In the end, Sam manages to kill a hellhound with Ruby's Knife and casts the spell.
Angel Tablet
8.10 Torn and Frayed
Samandiriel, who due to the spikes in his head has gone back to "factory settings," is tortured for anything useful that he knows. He speaks about the tablets which is apparently hardwired into all angels and before Dean, Sam and Castiel finally break in, reveals the existence of the angel tablet which interests Crowley who flees as the three break in.
After Samandiriel reveals that he told Crowley about the tablet, Naomi forces Castiel to kill him for revealing its existence. When questioned, she calls Samandiriel a traitor for revealing its existence as it is something that all angels would die to prevent demons from finding out about. Naomi reveals that like the demon tablet reveals how to seal all demons in Hell, the angel tablet may have something similar for angels on it.
