In times of dire need, the Eldar are also able to retrieve the spirit stones of long dead Eldar heroes and place them into the artificial bodies of [[Wraithguard]]s and [[Wraithlord]]s. These constructs are then piloted by the Eldar soul, which experiences reality as a dream. This process is considered necromancy in Eldar culture and only done as a last resort. The Eldar [[Warlocks]] who specialize in this process are known as [[Spiritseer]]s. [[Iyanden]], an Eldar Craftworld with a very small population is known for its greater use of these 'living dead'.

Spirit Stones are also an Eldar vehicle upgrade which allows the spirit to control the vehicle in case the pilots are incapacitated, in a similar way to the [[Power of the Machine Spirit]].