The user uses Lava Release to form ash particles. By making ash particles collide with each other, the ash can produce static charges. This can be used to generate lightning within the clouds that is more akin to natural lightning than chakra based lightning, making it that much more powerful. The user can then guide the lightning using their own lightning-chakra. This can make for several uses as the user can guide the lightning with pinpoint accuracy. Those who are caught within the ash clouds, aside from the electricity, can be cut by the razor sharp ash particles.
Trivia[]
This technique is based of the weather phenomenon known as a dirty thunderstorm, also known as volcanic lightning.