Source: The Inner Sea World Guide, pg(s). 205
Near the beginning of their journey, Truan and his companions discovered the ancient edifice of Hask-Ultharan in the pine forests of Iobaria. A gigantic stone cairn, it was marked with the weathered script of the cyclopes, who ruled the land during the Age of Legend, and whose stones served travelers in that land as a way marker. When their guides refused to approach it, Truan investigated, but was stopped by a howling mob of malformed giants. These creatures were said to have been led by the demon lord Kostchtchie himself, who crushed more than a dozen strong warriors before the humans fled for safety.
Even though elements of this story has been critiqued by scholars throughout the centuries, its basic facts remain uncontested.