Didn't the cyclops eat people?
https://www.greekmythology.com/Myths/Creatures/Cyclopes/cyclopes.html
Even though they also had only one eye and were as gigantic as Hesiod’s Cyclopes, Homer’s Cyclopes were neither blacksmiths nor obedient. Usually portrayed as violent cannibals, they led an unruly life, possessing neither social manners nor fear for the gods. “They have no laws nor assemblies of the people,” writes Homer, “but live in caves on the tops of high mountains; each is lord and master in his family, and they take no account of their neighbors.”
The chief representative of Homer’s Cyclopes was the man-eating monster Polyphemus, described by Homer as having been blinded and outwitted by Odysseus. Later authors make him a would-be lover of the nymph Galatea.
Is "the all seeing eye" a vampiric cyclops?