Eye of Horus

The Eye of Horus was Osirian device that beamed a signal that suppressed the renegade Osiran known as  Sutekh and held him prisoner inside a pyramid on Earth. This artefact resembled a round gend gem and was located in a pyramid on Mars which was safeguarded with multiple traps, including Osirian service robots loyal to Horus. (DW: Pyramids of Mars)