shadow-stalker

plural shadow-stalkers

1. A monster or other malevolent figure that moves about at night.

   The out of the night came the shadow-stalker, stealthy and swift.

   1999, Seamus Heaney, Beowulf, London: Faber and Faber, page 23

   2 more examples

   In the wan darkness, while the warriors slept, the shadow-stalker drew near from the moorland.

   1898, Stopford A. Brooke, English literature: From the Beginning to the Norman Conquest, New York: The Macmillan Company, page 73

   [T]he shadow-stalker will not draw anyone down to the shades unless God wills it.

   1952, John A. Nist, The Structure and Texture of Beowulf, London: Faber and Faber, page 53