While researching in the Briarstone library, Dora learned that the isle had been rumored to be haunted since 4315 A.R., following the death of the overseer of the construction of a fort intended to protect Thrushmoor from pirates. In 4584 A.R. Count Haserton Lowls I convinced the church of Pharasma to conduct an island-wide exorcism to combat these rumors.
Dora learned from further research that Captain Anoch Atherton didn’t die in a construction accident in 4325. Fort Briar’s overseer disappeared, only to be discovered a week later–his entrails strewn across the island. After Atherton’s death, work halted on the fort’s construction, but locals still reported seeing lights in the deserted, half-constructed structure. Rumors attributed the tragedy to the Briarstone Witch, who is believed to have inhabited the island.
In Chapter 21, Dora recalled a memory of there being two unfinished standing stones on the north coast of the island, and that they resemble what are apparently three such stones in Thrushmoor.
First Reference: Chapter 4
Other Notable References: Chapter 20, Chapter 21