Rogue Trader: Season One
The Warp or Immaterium
The Immaterium (also referred to as the Empyrean, Aether or Warp) is an alternate dimension of purely psychic energy that echoes and underlies the familiar four dimensions of the material universe. It is the source of all psychic powers and known instances of so-called “sorcery” and the home dimension of the Chaos Gods and their myriad daemonic servants. Superficially, it is the Warhammer 40,000 solution to the problem of faster than light travel, an equivalent to the Star Wars universe’s dimension of hyperspace. This function as a faster than light medium for travel is achieved by the Immaterium being a domain of pure psychic energy, with spacecraft navigating between currents, as in an ocean. The psychic energy that makes up the Immaterium is believed to be the direct result of the existence of sentience in the universe, in particular the Milky Way Galaxy. Considered to be a dark reflection of the material universe, the Warp is an ocean of chaos, raw emotion given energetic form. Stirred by emotion and action, the Immaterium is the true realm of Chaos, home to the dark gods who comprise the Ruinous Powers and their daemonic followers. It also is rumoured to house the spirits of the dead, and therefore can be considered the “Underworld” of the Warhammer 40,000 universe.