Shikadi Sentry

From KeenWiki

Shikadi Sentries are simple, yet effective robots created by the Shikadi and found on their 'homeworld' Shikadi World. They are not intelligent and move about left to right rapidly until they collide with their victims. They are used by the Shikadi to patrol areas of interest to them on their homeworld. They are incredibly robust, thus not to be toyed with.