An angular, diamond-shaped artifact with beveled edges resembling a stock certificate fold. The face is polished obsidian that shows no reflection in daylight but glows with inner emerald light at night. Brass inlays form zig-zag Art Deco patterns along the edges, and tiny gears turn silently behind the glass. The surface shifts and changes based on who views it, always reflecting the viewer's true relationship to the bearer.

The Margin Mirror marks players who are 'on margin' - dangerously close to being overtaken but not yet liquidated. These players can be challenged by anyone below them in standing, but the Mirror also grants them visibility into their rivals' true capabilities, making every encounter a calculated risk.