Ninja world

Kuroshin: shinobi world powered by Reikon. Jutsu styles: Ninjutsu, Genjutsu, Taijutsu, Kenjutsu, Fuinjutsu, Senjutsu, Kinjutsu, Dōjutsu. Villages: Shadow (assassins), Storm (speed), Ember (war fire), Mist (stealth), Frost (ice), Hollow Desert (seals), Verdant Root (healing). Clans: Kageyomi, Raizen, Yukimori, Kuroryu, Kurogane, etc with Dōjutsu + second awakened forms. Ranks: Genin → Chūnin → Jōnin → Tokujō → Anbu → S → Kage → Sovereign/Hollow Vessel. Wars fought via shadows as Hollow Beasts threaten world seal.