Stigmata

The Stigmata is the horrible disfigurement that all Claymores possess from their operation to become claymores. The stigmata separates claymores from normal humans and is almost a sure way to tell if one is a claymore. Humans would never have sexual relations with a claymore due to this disfigurement. This spot generally is considered a weak point on all claymores.

The stigmata can often be painful for many claymores and blood can start to flow out of it if touched. THUMA makes stigmata feel more natural and not bleed. This may indicate that the stigmata is the physical representation of the abuse inflicted by a claymore on her yoki which is manifested physically on the body.

The stigmata only goes away after awakening, part of the reason why awakened feel less conscientious to show their bodies. The stigmata can't be healed by normal healing techniques or yoki-synchronization assisted healing, remaining as a weak spot on every claymore's body. Only Sullivan has ever been shown to be able to permanently close a stigmata.

The stigmata takes many different forms. The organization has 4 main types of stigmatas resulting from its different operating methods:
 * Stigmata on the back - two small incisions near the shoulder blades where yoma-flesh is inserted. The flesh was placed on the spine and spread through there. Used for Destruction squads.
 * Full ribcage cut - A stigmata which cuts open the entire front of the body, similar to the sigmata of Yagi's original Claymore. Faith had this type of stigmata.
 * Heart implant - A relatively small implant where yoma flesh is inserted onto the heart and spreads to the rest of the body. If it is revealed, one can see the claymore's beating heart. This operation is also used to make Zeros. Gloria and Deborah had/has this type of stigmata.
 * Bulls-eye implant - An implant to the abdomen which looked like an enormous bulls-eye target.

According to Ceres, the materials used to make a Claymore show in the stigmata and can be used to determine if a warrior was an experiment or not.

Grace possesses a stigmata so horrible that it breaks the minds of those that see it. When yoma  saw it in Rain, they committed suicide uttering Aezathol. When a human, Mael, saw it, he went blind for 6 hours stating he never wanted to see it again, yet suffered no insanity. When Zero 4 saw it, she lost the will to fight and ran terrified and has been mentally unstable and hasn't talked since. When Omen saw it, he went insane and believed that pain was life and tried to kill Grace because he thought that if she awakened, she would end all life and pain. Grace is very sensitive about any topics related to her stigmata and never reveals her it, even against attackers, for this reason and covers it with her dickey and another piece of cloth.