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Is an alien race capable of shape-shifting by ingesting other's brains, gaining their skills and memories in the process, this capabilities degrade as the brain is digested, until they lose the ability to do so when the brain is fully digested which takes roughly 4 weeks.[[Image:Simulacra.jpg|thumb|A Simulacra xeno, being dissected by a Mago Biologis.]] The existence of the simulacra seems to be confined to the [[Calixis Sector]], specifically the [[Malfian Sub-sector]] with a high concentration of hiveworlds.