Thunderbolt Dragon is a Step Nine Dark Art.
It creates a massive bolt that either descends from the sky or is cast off the caster. In Volume 5 of the Light Novel or episode 9 of the Anime Adaptation, Vasilisa Yuryevna Mostovaya uses it to "punish" one of her District Leaders for failing to murder Moroha Haimura . It is shown to be able to burn down a house when it descended from the sky, while also capable of incapacitating Moroha for a night when cast off the caster. After being hit, Moroha needed treatment that lasted a whole night.