Doppleganger

A doppleganger, also known as a changeling, is a humanoid creature capable of changing its form to other humanoids.

Changelings can be produced when changelings mate with members of other species - it either produces a full-blooded changeling or member of the other parent's species. A mother who didn't know the true nature of her mate would be taken by surprise by the appearance of her child and thus assume it had been stolen away and swapped by fey.

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