Developed in 25 ABY, the 1WD-81 light defender droid soon became one of the Eniam Army's primary war droids. They were from the light defender line, which had been on for generations, unlike the new, more war-oriented machines. They used a versatile repulsorlift system in their lower bodies to maneuver. This allowed them to fit into small places to ambush enemies, unlike their bulkier 2WD and 3WD counterparts. Like the 2WD-22 and other ENE droids, their middle torso and head resembled that of a Drijoken.