"MAGIC STUFF"
I guess that's the official answer -- I asked Mark Rylance
When he said that, I asked "like bones and amulets?" (cuz I thought I saw a piece of bone fall out that day), and he just smiled and said "Magic stuff"
I just thought I'd post it, since no one else seemed to be sure either
You don't go to the dragon without a present - Mark Rylance