The Oculus Abyssi is an aquatic species, able to breathe equally well in the air and underwater. While able to fly like other oculi, they are faster and more maneuverable underwater.

An oculus abyssi has the usual spherical body with a single large eye and a large mouth full of many sharp teeth; two small eyes on long flexible stalks extend from the top. Hanging beneath the main body are a pair of vaguely humanoid arms with nasty claws at the end; in melee they attack with these claws and their bite. However, few of these monsters would choose to engage in melee without first using their magical powers.