Ryujin

The Ryujin is a spinning ball of chakra formed with high concentration of lightning chakra around the spinning ball and held in the palm of the user's hand.

Overview
After seeing Sasuke's Chidori and Naruto's Rasengan Heiden made a ball of chakra like Rasengan and then covered it in lightning chakra as it curls up his arm like Chidori. So in making a green rasen-chidori as a green dragon appear behind him and charge as Heiden does. Heiden can also throw Ryujin when he cover his chakra sphere in his green lightning chakra. When he throw it it takes form of a green dragon rushing forward.