Girubokku

Girubokku are floating eyeball enemies in Zelda II: The Adventure of Link. They appear on the eastern continent in caves and various outdoor terrain, such as plains and forests, as well as the Valley of Death. They float slowly after Link with their lids closed, leaving them invulnerable. Occasionally, they stop briefly to open their eye, at which point Link can attack them. Despite being small, slow, and nonthreatening, Girubokku deal a very large amount of damage on contact, taking a full unit of health even after Link has obtained all health upgrades. Additionally, they take a fairly large amount of damage.