From the introduction:
This document contains numerous revelations regarding the Chronicle of the Throne of Thorns and is written for Game Masters only. If you plan to experience the chronicle as a player you really shouldn’t continue past this sentence.
The barbarian legend...gives voice to an allegory describing the basic design of the world. The barbarians have borne witness to battles between the three principles of the legend, and have again and again been victimized by the aftereffects of such conflicts.