Sceadugenga
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The Sceadugengan (Singular: Sceadugenga), or "shadow-goer", are fantastical beasts which are neither living nor dead, and which can shape-shift. They dwell in the forests of England. The first element of the name is from Old English sceaduwe (shadow)[1] and the second elements is likely to be from Old English gong (a going or journey) [2] or Old English gan (to go)[3].
The Sceadugenga are mentioned in Beowulf and form part of a sub plot in The Saxon Stories series by Bernard Cornwell.