Be careful: potential spoilers on "Game of Thrones" season 7 will follow. After the "GOT" season 7 premiere, an eagle-eyed fan discovered an incredible clue about Jorah Mormont's fate. Pausing the video at the right moment, Reddit user Beastmodekait spotted some very interesting sentences in the forbidden book Samwell Tarly is reading in episode 1.

The forbidden book and the man in the cell

Samwell Tarly has been put on latrine and kitchen duty by Archmaester Eborose. He's at the Citadel, just like Jorah Mormont. In the "GOT" season 7 premiere, he steals a key to gain access to the Forbidden section of the library, and in one of the forbidden books, he finds out that there is a large amount of dragonglass at Dragonstone. Shortly after, he decides to send a message to Jon Snow.

At a certain point during Sam's research, Jorah Mormont grabs him from a cell where he's being contained, and his arm is fully greyscaled.

The cure for the greyscale

As the Redditor Beastmodekait noted, very interesting information about the dragonglass is hidden in the forbidden book read by Samwell.

As you can see, if you look carefully at the left side of the picture above, a passage seems to talk about tales of dragonglass used as a cure for disease when it's ingested. This is a strong clue of what is going to happen: Samwell Tarly will help Ser Jorah.

And there is more: Sam also discovered where the dragonglass can be found in Westeros - At Dragonstone - where Daenerys Targaryen is now located. If you think about it, the cure for Jorah's disease is just where Daenerys is. It looks like he is meant to be with her.

Samwell will probably help Jorah because he knew his father, Jeor Mormont, Lord Commander of the Night's Watch (and because he is a big-hearted guy). Although we cannot be sure about it, we can also speculate that Sam's salvation of Jorah could ease up a possible Jon Snow and Daenerys Targaryen's alliance.

The dragonglass is powerful stuff

If you think that eating dragonglass as a cure is weird, remember that we already saw how powerful the dragonglass can be: in "Game of Thrones" season 6 we were told that Benjen Stark's transformation into a White Walker's wight was interrupted by the Children of the Forest, who saved him shoving a piece of dragonglass into his chest.

Moreover, we know that Shireen Baratheon's greyscale was cured when she was an infant, and she was living at Dragonstone at the time, where the Dragonglass can be found.

Don't forget: "Game of Thrones" season 7 episode 2 will air on July 23, on HBO. The next episode's title is "Stormborn".