PRDX-4 is a Robot Picnicker NPC in Avant Gardens, located at the Launch Area. PRDX-4 is one of the few known Assembly Defense Robots that has not been corrupted and turned into a Stromling Mech. PRDX-4 hangs out at the Launch Area with Eeekums, but will not talk to players until the Maelstrom fog is cleared from the area. PRDX-4 is also a Model Vendor whose inventory consists of models from the Mech Bay Ball-Bot model set. Players must interact with PRDX-4, Dusty Holster, and Kirsten Quasar to complete the Making More Friends achievement.