Knowledge of Galloway
Hamish knows that there used to be a covenant known colloquially as Wicker Hill in Galloway. It was frequently visited by other Diedne for their secret rituals that not even the most trusted grogs were allowed to witness. Hamish has been there and knows the approximate location, but it seemed to be deserted when he passed through earlier this year. You might have got lost; he did not know the area very well, but he finds it more likely that the covenant had fallen. The covenant as he remembered it with houses made from natural stone.