While in the service of the Goa'uld System Lords, the Jaffa guards often wore helmets or masks that hid their features and intimidated the System Lord's human slaves. The masks were typically modeled after an animal associated with the particular Goa'uld the Jaffa served; for example, Apophis's Serpent Guards wore cobra masks while Ra's Horus Guards wore falcon masks. The more complicated helmets (such as Horus helmets) could be retracted into the body armor of the Jaffa, or taken off the armor completely, while simpler masks (such as Serpent helmets) simply opened to expose the Jaffa's face. On occasion, System Lords themselves would wear more ornate versions of Jaffa masks to deceive their human slaves (Ra in particular was well-known for his opulent mask), or on the (rare) occasion wher