The Inheritors are a more extreme sect of the Antithesis Creed, and are common within former holdings on the Rim Worlds Republic. The Inheritors originated in response to the horrors of the Succession Wars. They believe that the Successor States will destroy or deplete each other, to the extent that an army raised in the Periphery will arise and conquer the Inner Sphere.

In order to realize their destiny, the Inheritors believe it is imperative to clandestinely build another military-industrial complex within the Periphery, comparable with that of the Rim Worlds Republic. However, some Inheritors are not necessarily outwardly militant, realizing it may be more important to survive until the time for action is near - many Inheritor groups are actively involved in survivalist/separatist communities.