The idea of "the Pilgrimage," a journey to the legendary place where mortals could directly interact with the Gods, was an ancient mythological trope on many human-settled worlds of the Milky Way Galaxy, including Lorgar and the Word Bearers' homeworld of Colchis. Of course, such a place, the Warp, did exist, and one could discover the Primordial Truth of the universe there, i.e. that the Immaterium was dominated by the powerful spiritual entities known as the Chaos Gods.