Opticron

The Opticrons were a type of droid built by the agents of the Sith Emperor using arcane and exotic technology. Designed as stealth surveillance units, they were tasked with shadowing the Emperor's Wrath after the previous Wrath, Lord Scourge, betrayed the Emperor. The Wrath was alerted to the Opticrons' existence on Rishi by Darth Vowrawn, leading the Wrath to eliminate several of them.