Monapon

The Monapon is a Biter used by in Xenoblade Chronicles. It is a unique weapon in several ways:
 * Its damage of 1 makes it practically worthless for attacking.
 * It has a very high crit rate of 30%, which is higher than any other normal weapon.
 * It is defined as having three max-strength cloak gems. This would make it the best way to sneak around enemies, but the only way to obtain it comes from an enemy that says "drop this with zero slots", so these gems are not actually present.