Dimeritium is a special sort of metal which suppresses magical power. Vilgefortz of Roggeveen, Artaud Terranova and a few other Chapter members, were shackled with dimeritium after they were accused of treason by Philippa Eilhart and Dijkstra during the reunion of mages on Thanedd Island. It was stated that being shackled causes unpleasant side-effects for the mages. Three quarters of all dimeritium is produced in the northern kingdom of Kovir and Poviss.