Lava Release: Bootburner

The user expels a super heated fireball from the mouth by building up a tremendous amount of chakra and then applying nature transformation while expelling it. While the fireball itself can act as a projectile it is mainly used for the immense heat it creates because the heat is capable of turning the floor under the fireball into lava. Lava created this way will also be super heated and hot enough to melt the dirt around it. Furthermore it is also easily capable of burning the enemy's feet( hence the name.

A skilled user can even control the direction of the fireball adding to the power of the technique.