Threia Hazelgrimm is a playable character in Atelier Escha & Logy: Alchemists of the Dusk Sky. Threia is an historian from The Center and an acquaintance of Marion Quinn. She specializes in ruin investigation and researching the history of the past era. Described as being a bit "troublesome" by Marion, she often appears calm, but is somewhat easily upset. Escha even described her as "a little bit scary" after their first encounter. She does not associate much with other people and finds social disposition as nothing but trouble. She does not get along very well with Reyfer Luckberry.