Ohm

Skybreeder Ohm (スカイブリーダー・オーム, Sukaiburīdā Ōmu) the fourth priest, punishes criminals with the Ordeal of Iron, where the victims are cut into pieces by barbed wires when they step onto hidden panels.

Personality
Ohm is a calm and serious character whose goal in life he explains is to free people. However, by this he means killing them and freeing them from various burdens related to life.

Abilities
He attacks with a sword with the blade made of Iron Cloud, a brand of Skypeian cloud said to be as strong a steel, but as light and flexible as the clouds that made up the whole of Skypeia. In addition, it has a Eisen Dial equipped at the pommel, which is actually a Milky Dial for his Iron Cloud Sword that allows him to turn the sword's blade into any shape including a wall or a whip. He carefully placed Dials all over his ordeal that activated as they were stood on formed barb wires. He also has a giant, pale yellow dog called Holy. Ohm is often seen riding on him or simply sitting on his head. He also taught Holy how to fight, and use martial arts. Ohm's ordeal was touted to have a 0% chance of survival, until Zoro defeated him.

Survival Game
After beating Gedatsu, Chopper makes his way to Ohm's ordeal. This ordeal remained off screen, and Chopper's unconscious, bloody, body is later found by Roronoa Zoro. Ohm however does not take credit for Chooper's defeat and explains the working of his ordeal, being that he does not need to even move to defeat his opponent. He is defeated by Zoro who, despite Ohm using Mantra to predict his attack, waits for him to attack to give away his position. He then cuts through Ohm's shape-shifting sword using the 108 Pound Cannon attack to defeat him.

After the events of Skypiea were finished and Enel defeat, the Shandians rounded up all the priests and banished them to a desert cloud.

Attacks
Many of his attacks start with "Eisen", which means "iron" in German.

Eisen Whip: He unleashes a powerful whip-like attack from his sword, making it look like a projectile attack at high speeds.

Eisen Fan: Ohm shapes the blade of his sword into a fan-like blade and strikes against his opponent.

Eisen Fork: He shapes his sword into a giant fork and wields it like a whip once again.

Eisen Back: He forms a solid wall to block any of his opponent's attacks.

Eisen Fleuret: An attack when he shapes his sword into a long, sharp spear and projects it against his opponent.

Trivia

 * He's a playable character in One Piece Grand Adventure.
 * "Aum" (ॐ), also spelled "Om," is the holiest syllable in Hinduism, and begins most mantras.