Iron Cleft

Iron Clefts are a powerful sub-species of Clefts found in Paper Mario: The Thousand-Year Door.

Iron Clefts are larger than normal Clefts and have a dark gray coloration. As their name implies, they are made of impenetrable metal. Even if Mario manages to have the Piercing Blow badge equipped, they still won't take damage.

The only known Iron Clefts are the Armored Harriers.

Varieties of Clefts

 * Cleft
 * Bald Cleft
 * Hyper Cleft
 * Hyper Bald Cleft
 * Moon Cleft

Trivia

 * A special attack by the Yoshi Kid provides the only known way to defeat the Armored Harriers for the first time. If Grubba (or Jolene) asked the player not to use any FP, or not to let the partner attack, that would make victory impossible for that particular match. It is unknown whether or not they can actually make these demands for this particular fight, but it's unlikely.
 * Since every character in the major league would have to beat the Armored Harriers in order to stay ranked above them, it is plausible that they have other weaknesses (or that the Major League fighters knew their main weakness).