Affide crystals functioned as potent neurotoxins, taking the form of crystals, and were employed by spies when facing capture or torture. These crystals acted as a suicide pill, frequently concealed inside a prosthetic tooth carried by the spy. If captured or tortured, the spy would forcefully bite down on the artificial tooth, causing the affide crystals to dissolve, thereby halting respiration and leading to the individual's death in a matter of seconds, with the exact timing varying based on their species and overall physical resilience.