Simulacra

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Simulacra are humanoid xenos with slender, pink, fleshy bodies, bulbous forearms and lower legs, and a pointed, featureless head. Simulacra can take on the form of a being for a limited time after consuming that creature's brain, this effect allows them to behave as that individual for the duration of their transformation, knowing everything their prey knew. They're essentially doppelgangers.