Often identified as being glasslike and crystal-esque, the Codex was fragile, with rough handling or falls damaging it, but remarkably light in weight, and self-repairing of physical damage. Most extraordinary of all, the Codex reacted to the Force in particular ways, and could only be activated by a Force-sensitive. The Codex also illuminated when held by a Force-sensitive, glowing a bright golden hue of such radiance, it was once likened to the brilliance of a sun.