Shukuyū

The Shukuyū is an Amaterasu-enhanced form of the Raitama with similarly enhanced effects and the same drawbacks.

Overview
Ryun invented this technique shortly after losing the ability to preform the Yonkō Raitama. It requires precise chakra control to form a sphere of lightning chakra around a similar sphere of black flames. The result is a nearly unstoppable jab which combines the piercing effects of lightning with the unquenchable black flames of Amaterasu.

Trivia

 * The name Shukuyū comes from the ancient Chinese god of fire and of spring.