Rimrunner

An insectoid race travels the galaxy and colonizes uninhabited and long dead planets. Force shields were created to protect their planets from the constant attacks of the arachnoids. The force shield generators need regular recharging, a task for which a group of elite insectoid warriors was created. Riding their reptilian mounts (Runners) they patrol the colonies, recharging the generators and destroying any hostile lifeforms that have penetrated the shield.