Ordeal of Iron

Ordeal of Iron (鉄の試練, Tetsu no Shiren): The survival rate was 0% and is run by Ohm. Since Zoro passed, it gives him an immortal attribute. Ohm uses his sword to try to slash someone's heart. If it hits, the person will instantly die. In addition, he rigs his territory with Milky Dials full of iron cloud linked to pressure plates on the ground. If his victim accidentally steps on one of these plates, the dials shoot the iron cloud out in the form of barbed wire, shredding them.

This was the last ordeal in Skypiea arc and only Chopper and later Zoro were involved in the game.

This ordeal has a White-Barbed Iron Deathmatch, a dome of iron cloud strands with thorns sticking out, creating a cage, stopping their victims from escaping. Zoro originally commented on how it was unnecessary, since he didn't had any intentions to run away. It later showed that it was all barbwire, making it lethal to get stuck in it.

In the English version of Pirates Carnival and FUNimation's edited-for-TV dub, it's called the I.Q Iron Test.

First Appearance: Chapter 251; Episode 164