A Keeper is an organic construct used by the Drakh to control the behavior of an individual enemy. It is an octopus-like creature consisting of a small body, a few tentacles, and a single eye. It presumably derives sustenance by attaching itself to its host's circulatory system, but the details are not known. Like the Shadows, a keeper is invisible in normal light. They become visible, however, if injured or rendered unconscious. Even if seriously damaged, a keeper will regrow on its host in a matter of minutes.