Iron Imprisoner

The Iron Prisoner (アイアンプリズナー) is an Unversed that is found in Kingdom Hearts Birth by Sleep. Although it is a boss, it only appears at Mirage Arena. When it is first fought, it is chained and imprisoned in a gibbet, but it gradually releases itself over the course of its battles. The four forms it takes are known as Iron Prisoner I, Iron Prisoner II, Iron Prisoner III, and Iron Prisoner IV.

Appearance
The Iron Prisoner is a large, powerful Unversed whose entire body is clad in metal armor. It wields a firey hammer as large as the creature itself. As it levels up, the armor's features become more pronounced. In its first form The Unversed's arms chained and its legs trapped in a gibbet. Its helmet is horned and sports fierce red eyes. Its second form is the same as the first albeit its arms are free and it wields its hammer. Its third form is the same as the previous two, the only difference is that its legs are free, allowing more mobility. Its fourth and final form is extremely different than the previous three. Its body sports a darker shade of grey, the eyes have a fiercer design than the others.

Abilities
The Iron Prisoner is one of the strongest Unversed bosses in the game. It wields its hammer in battle, and the element of fire to enhance its attacks. It can erupt out of the ground with the force of a geyser. It can also entrap players in cages leaving players at its mercy. It can also spin around the arena while coated in a firey aura, burning players on contact. In its first and second form it can shoot lasers from the bottom of the gibbet to burn players. In its fourth form it can suck players in to deal damage.