The eyehead, or Okogłów in Polish, is a monster with four pairs of thin legs, a segmented body, and eyes mounted on stalks. From a distance, the creatures resemble logs as they don't tend to move very much. They are not aggressive, but can attack when threatened. There is no known antidote for their venom. They have extremely sensitive hearing and metallic sounds such as those caused by swords can cause them extreme pain. Geralt frightened on away by banging on a metal cauldron lid with a ladel.
[...]
The creature slowly crawled onto a log. It looked at the humans and the dwarves, slowly turning its eyes, which were set on stalks. It was barely moving. It cleaned the ends of its legs, lifting them up one by one and carefully nibbling them with its impressive-looking, sharp mandibles.
[...]
'The that's sitting there is an eyehead. A creature of Chaos. A dying, post-conjunction relic, if you know what I'm talking about.