Within this matrix, the souls of all the Craftworld's dead reside in a form of group consciousness, providing both a well of psychic power for the ship and a massive ancestral mind to advise and guide the living. With the rise of [[Slaanesh]], the Infinity Circuit is the closest thing that the Eldar have to an afterlife; if their souls are not caught and integrated into it, they will be lost to the [[warp]] and devoured by the Great Enemy. For this reason the Eldar will defend their Craftworlds with a fury and tenacity almost unrivalled: they risk losing not only their home, but the souls of their ancestors as well.{{citethis}}

Upon a Craftworld, the Infinity Circuit can be accessed at any time by any citizen via an '''Infinity Terminal'''. This allows psychic interface with the Circuit, and the user can identity the present location and emotions of any Eldar within the Craftworld, as well as, exchange instant messages with individuals in the form of telepathic visions. They can also seek guidance from past friends or ancestors.{{Fn|5}}

The infinity circuit emanates light from its spirits that is referred to as the '''will o' the wisps'''{{Fn|7}} (or '''will-o’-the-wisps''').{{Fn|8}} These lights are the spirits contained within. The presence of a [[Spiritseer]] gives off an aura of focus that returns some sense of sentience to the glowing and bobbing orbs of light, each being a individual spirit. This returned awareness agiates spirits into activity, often flocking to orbit around the spiritseer.{{Fn|7}} The [[Exodite]] equivalent of an Infinity Circuit is known as a '''World Shrine'''{{Fn|4}}, which contains the heart of the [[World Spirit]].{{citethis}}