Any person serving a sentence or sentences within the State prison system who, during the term of such imprisonment, willfully and intentionally inflicts upon himself any injury resulting in a permanent or temporary incapacity to perform work or duties assigned to him by the Division of Prisons of the Department of Adult Correction, or any prisoner who aids or abets any other prisoner in the commission of such offense, shall be punished as a Class H felon.
N.C. Gen. Stat. § 148-46.1