(“Hardheads”), who believe that peace and stability can only be established under one rule—theirs. The planar faction known as the Harmonium is actually just a small part of a much larger entity which was once a Nerathi Legion. In Sigil, they serve as the city’s police force, and their headquarters is the City Barracks. They are related to present day authoritarianism, particularly religious evangelicalism and fundamentalism. It is strongly advised that visitors to Sigil never, under any circumstances, use the term ‘Hardhead’ in front of Harmonium members.