Rosheen Meanderer was an ancient giant renowned for her constant babbling and her accurate prophecies.
She was the sister of Brion and Kiel, who collected stories for her. Rhys sought her out to find a way to stop the Great Aurora, but her prophecies dictate that it's a natural and unstoppable event.
Rosheen was one of the few individuals, whose personality, memories, and appearance (the moss grows over) was left intact in spite of the Great Aurora. In Shadowmoor, she searches for her goat, unaware of the destruction this causes for others, and Jack steals her diary which is sought by Oona and Maralen.