Blood Knife

''ON ATTACK: If defender is armored, kill them. If not, die.''

ON DEFEND: If attacker is unarmored, die.

When you have it: A powerful offensive armor with a terrible price: you may not attack or take hits from unarmored enemies on this side. So why keep it? It has the same effect as Piercing on armored foes, but it does not dispel. In other words, it has unlimited uses. While equipping these to all sides isn't recommended because you would be vulnerable to foes with naked sides, having one of these will save you from sticky situations if you can pay the price.

When an enemy has it:

The best defense and offense in this case is to let them hit a naked side. This instantly kills them and leaves you unscathed.