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In times of great need [[Spiritseer]]s{{Fn|5b}} may separate an [[Aeldari]] spirit from the spiritual mass of a [[Craftworld]]'s [[Infinity Circuit]] to place it into a Spirit Stone put aside for this purpose and implant it into an artificial form,{{Fn|1a}} although the consciousness within is never fully as individual or alert as a living Aeldari as they exist at once in the real world and the spiritual world of the [[Warp]], moving through reality as in a dream where thoughts and feelings are as tangible as bone and steel.{{Fn|1a}} This necromancy is unpopular, but viewed as a necessity of the dire circumstances many [[Craftworld]]s find themselves in.{{Fn|5b}} These spirits may be implanted in bodies as such as the [[Wraithguard]]{{Fn|1a}} or [[Wraithlord]]{{Fn|5b}}, or in vehicles to serve as pilots should the living pilot be rendered senseless such as is necessitated within the [[Hemlock Wraithfighter]]{{Fn|5d}}} or as an enhancement to a [[Grav-Tank]].{{Fn|5e}} The largest of the [[Wraith Construct]]s, the [[Eldar Titan]]s require living [[Steersmen]] to guide them across the battlefield. To accomplish this tremendous task, these mortal pilots wear Spirit Stone headbands (in addition to the Spirit Stone which will save their soul from [[Slaanesh]] should they perish) that allow them to psychically interface with the tremendous stones of ''carrecenad'' within their titans and thus lend a portion of their soul to this persuit: creating a small-scale [[Infinity Circuit]]. The intermixing of these souls creates a new gestalt within the titan, which is reflected by the addition of ever more new runic letters onto the [[Wraith_Construct#Spirit_Runes|Spirit Seal]] of the Eldar Titan, and in the tremendous tactical expertise present in venerable titans. As Titans are often passed along familial lines within the [[Titan Clans]], a titan's soul may reflect generations of direct ancestors.{{Fn|24}}