This is a style of fūinjutsu developed secretly in the Leaf by Uzumaki clansmen under the administration of the Ninth Hokage. It has been described by those who have seen it as "Dark Magic" (lit. 黒魔術, "Kokumajutsu", VIZ; "Sorcery Power"). The employers of the seals essentially have the power to "write" them in thin air and have them attach themselves either to the air or to solid objects, unable to be budged by an elemental force like wind or water once the seals are written where they are. These high-complex seals require diligent mastery to form quickly and are usually done in large groups.
Each of the seals have thousands and sometimes millions of formulas written within them, despite it only requiring simply finger or brush strokes to formulate them. They appear in black color and have commands written on them—largely powered by Yin-Yang Release. Users are classified as Yin-Yang experts, able to create—through the seals—something from nothing, though requiring considerable chakra. For example, if one were to write on a seal "implosion below", the ground below would be embossed. To be more specific, if they were to write "implosion below 1 meter deep", such would happen. If a user controls an elemental nature, they can also infuse their release into their seals.
One of the most extraordinary abilities of those who use Choshizenno Fūinjutsu is the ability to right their seals with their feet and also the ability to quickly make these same seals turn invisible after their conjuring.
Those with elemental affinities can add their own power to the seals as well and if natural elements are located below, they can become a medium to the writer's desires.