Angel Tablet

The Angel Tablet is one of three Words of God. It pertains the nature of Angels.

History
At some point, the archangel Lucifer obtained the angel tablet and locked it away in one of his crypts. This information was passed down only to Azazel, who then passed it down to his "daughter" Meg.

Years later, Crowley began pursuing the tablets. He captured Samandriel and tortured him until he hit his factory settings. This led Samandriel to reveal the existence ot the angel tablet. This horrified Naomi, who believed no angel should reveal such information, since it would pose a risk to the angels themselves. She orders Castiel to execute Samandriel for his blunder.

A hunt for the angel tablet begins. Crowley, who is in possession of Meg, tries to torture the information out of her, but she only gives vague locations. She tells the exact location to Sam, Dean and Castiel when the three come to her rescue.

At Lucifer's Crypts, Dean manages to locate the tablet and free it from its rock casing. When Castiel touches it, he is set free from Naomi's mind controlling, but instead he is filled with an intense desire to protect the tablet at all costs. Castiel runs away with it, hiding from both demons and angels.

Both Naomi and Crowley successfully locate him, but it is Crowley who retrieves the tablet by removing it from Castiel's stomach. Now in possession of a priceless artifact, Crowley goes to see Kevin where he has the prophet held captive so Kevin can translate it for him.

Scribe of God, Metatron, rescues Kevin. Having taken Crowley's half of the Demon tablet, Kevin is able to combine the two halves and reveal the third trial necessary to seal the gates of Hell: cure a demon. Sam and Dean choose to cure Crowley and lure him into a trap, offering to trade the Demon Tablet for the Angel Tablet. Crowley is captured, and the angel tablet given to Kevin to translate.

However, while Kevin was translating the trials for Sam to complete, Castiel chose to trust Metatron and complete the trials necessary to seal the gates of Heaven based on what Metatron said. Kevin discovers from reading the angel tablet that Metatron's trials do not match ones listed on the tablet. Unfortunately, he is too late to warn Castiel of Metatron's deception.

Both the angel tablet and the demon tablet remain in Kevin's possession until Metatron orders Gadreel to kill him and retrieve them. Using the angel tablet, Metatron gains God-like powers. To stop him, Castiel and the newly-reformed Gadreel attempt to sneak into Heaven to destroy the angel tablet. Castiel succeeds, and Metatron is reduced to a regular angel.

Contents
The Leviathan tablet contains information on how to shut the gates of Heaven. The trials are never revealed. According to Kevin, it is more difficult to decipher the angel tablet than it is to decipher the other two.

Uniquely, this tablet granted Metatron powers equivalent to a god, making him immune to rings of Holy Fire. It took the destruction of the tablet to remove Metatron's powers.

Trivia

 * This is the only tablet shown capable of granting powers to the user.