Face-Stealer

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Face-Stealers are creatures that can change their form to any other humanoid body. Unlike other shapeshifters, they can only change their shape after incorporating biological fragments of a person they wish to impersonate.

Face-stealers are sterile, as they are unable to reproduce sexually. They lack primary genitalia and cannot replicate it when transforming into a new body. Organizations trying to root out face-stealer spies therefore often use anatomical spot checks. This physical absence is ordinarily sufficient to identify a face-stealer, barring rare anatomical conditions, but ordinary anatomy cannot clear a suspect because other kinds of shapeshifters may retain it.

Their classification as a subspecies of shapeshifter is also debated, as they can be children of exclusively human parents. It’s theorized that the ability to shapeshift evolved independently from mutations from exposure to large amounts of magical energy, instead of being in the same lineage as Doppelgangers.