Steel Release (Koton) is the KG and superior counterpart to Earth Release. Its the use of Fire and Earth to create a metallic substance which can be manipulated both directly from the user's body or the ground.
I need it for my evil plans

. Well, actually I plan to get it for my Kakuzu bio but first I need to get acquainted with the jutsus. Also, a big part of me wanting to learn it is so I can have an extra skill to pass onto students.
Fire and Earth, using them both in a different way to the one used to create lava. The fire creates a blast furnace-like effect which smelts the earth into steel.
Hiruko