Chapter II
Crimes
Section II
War crimes
Article 11
War crimes involving the employment of prohibited methods of war
Anyone who, in the context of an international armed conflict or a non-international armed conflict:
(j) Commits perfidy, which means the act of killing, injuring or capturing by inviting, with intent to betray, the confidence of an adversary that he or she is entitled to, or is obliged to accord, protection under rules of international humanitarian law;
shall be punished with a term of imprisonment of 10 to 25 years.
Killing or wounding a combatant who has laid down his arms and surrendered at discretion - IAC
Killing or wounding a combatant who no longer has means of defence and has surrendered at discretion - IAC
Unique provision - war crimes
EDIT.