Tetsu rippōtai no Mi

This Paramecia type devil fruit will give it's consumer the ability to create cubes of iron on any part of his body.

The created cubes are perfect iron without the slightest grain of another element and are aligned on atomic level, they will stick to other cubes of the same iron without need for welding or other kinds of fixation. However, since the devil fruit powers are blocked by sea water, the cubes will rust about twohundert times faster than normal iron if exposed to sea climate.

The iron cubes and cubistic structures created by the devil fruit consumer will weight nothing to him or her, but seem like normal, heavy iron for everyone else. They are also influenced by magnetism, which is their secound weakness apart from the high vulnerability to rust.

A good method to use this ability is to create temporary armor at the places of the body that are about to be hit by a strike or projektile. Apart from that the fruits power can be used to create any kind of building and even ships of iron, given that you find enough anti-corrosion color to paint it with before it rusts.