Thorn has a number of dreams that are pivotal to the plot of Bone however the most reoccurring one forms the key plot of her early biography.
An infant Thorn is ordered to evacuate Atheia by Lucius Down. She is led away by a number of masked figures who are followed and intercepted by Rat Creatures. She is led off by a sole hooded figure that is later revealed to be Briar Harvestar who hands her over to The Great Red Dragon. Briar says she will stay with the dragon until it's safe.
The dragon leads Thorn into the cave where she encounters many other dragons.