We return to the droid army of the Confederacy of Independent Systems, specifically the BX commando droids and the Droideka destroyer droids; six each. These should be fearsome enough mechanical obstacles for your players.
You could use these paper miniatures in a Clone Wars campaign for the Star Wars roleplaying game, but you could also have these appear in Rebellion Era campaign whereby players discover private individuals or corporations or governments that still employ these droids for security purposes. Perhaps players stumble across a crashed Separatist warship where these droids have long been in stasis, awaiting for some clumsy character to inadvertently activate them.
Can’t wait to use these with you guys at some point.