The A3L-N sentinel droid was a model of security droid. The Crimson Dawn criminal syndicate used a series of modified A3L-N sentinel droids in bulked-up chassis, despite the fact that the model had been recalled decades prior. Upon encountering the Crimson Dawn droids aboard the organization's flagship, the Vermillion, the rogue archaeologist Doctor Chelli Lona Aphra recognized the model as a modified A3L-N sentinel droid.