Steel Release: Fire Forge of Takemikazuchi

The user uses the normal Steel Style: Impervious Armour then causes the black steel to melt due to Fire Release chakra embedded to in the user's body. Using the melted metal, the user is able to mould weapons to a greater extent than Ishigakure's method.

Drawbacks
The user can only use this technique once every month, as it uses the user's body material but if used in conjunction with Steel Release: Body Material Regeneration the user can use it as many times as their chakra allows.