The Hedron Chamber Keycard is a sleek, rectangular access card with a minimalist design, featuring a matte black finish and subtle metallic accents. Its surface is smooth with a slight texture for grip, and it includes a small, glowing blue emblem of the Federal Bureau of Control (FBC) on one corner, indicating its high-security clearance. The edges are slightly rounded for a modern, ergonomic feel, and the card emits a faint hum when activated, suggesting its connection to the Oldest House's paranormal energy.