Reikoku

Xenon is a is a shinobi currently leading the evil organization known as the Shadow Kights. He is also the founder of the Lava Release and Boil Release.

Background
Xenon is the first ever man to use the Lava Release and Boil Release. He was once a man feared by all shinobi across the land, to the point he was once called a God. Running through lands taking over and manipulating the lands. Though his reign was cut short once he came across a kunoichi of the name of Mei Uzumaki the mother of Asura Uzumaki. Their fight was brutal though with her Rinnegan the fight had always switched tides, her with the upper hand then him gaining it. Though in the end Mei pulled a sly one with her clans trait of Fuinjutsu. Mei was able to seal him away with a sealing technique, leaving the world at peace. But a few years later, a man named Terrox found him and was able to undo the seal, freeing him and letting him once more cause havoc. Though Terrox's intention was to get him work with him but instead he went his own way. Going their separate ways both men went on to create their own organizations and Xenon's team is known as Shadow Knights. To kick off the groups start, Xenon and the Knights went into Iwagakure killing any man who opposed them, ultimately destroying the village.