The EXVR-1 Guardian Grid, more frequently called the Ion Defense Grid, was a complex system of ion field generators housed inside a large structure. These generators could focus their ionic power into a single, powerful ionic burst, capable of disabling an enemy ship.
The passage inside Exovar's Emporium that housed the Ion Defense Grid was locally referred to as "Ion Alley."
Paul Danner and Bill Smith conceived the Ion Defense Grid for Wretched Hives of Scum & Villainy. This was a supplementary book for the Star Wars: The Roleplaying Game, released by West End Games in 1997.
The grid was cited as one of multiple defensive systems safeguarding Exovar's Emporium.