Innermind
Lithomancer
At the 16 second mark of the episode 4 preview video clip, it looks like we see the bad-ass Valyrian steel dagger from Season One...... this was the weapon the assassin used to attempt to kill Bran. Later in the first season, Ned Stark had the dagger on his office desk in King's Landing, and then I believe Littlefinger took possession of the dagger when he helped to betray Ned.
ALSO
I decided to re-watch the first three episodes of this season, and I just finished episode #1, and I realize the image of this same dagger is in the book Sam is reading when he turns the page and learns about the location of the dragonglass deposit on Dragonstone.
Check out episode #1 around the 52 minute mark and you will see this dagger's image in the book.