A "Narukami" dragon warrior that has the nickname of "Violent Electric Dragon."
It possesses an irregular physical attribute where it is able to produce electric charge in its body without any special organ, thus any uncontrollable surplus charges are always overflowing out of the body. The stored charges tends to excite it in proportion to the amount that was accumulated. If too much charges are stored, this may even cause it to lose its sense of self.
It was recorded that there was a time where it lost its rationality, it slain the enemy's general with overwhelming power and proceed to run amok, destroying everything around it until there is nothing left.
"It is no longer a Thunder Dragon" This is what the recorder who scribed that incident said. When asked with "Then, what is it?", the recorder only said "It is the thunder itself."