Once a character reaches level 100, you can "promote" them. This resets their level to 1 but grants permanent stat growth boosts and allows you to equip additional item skills.

The file you are likely looking for is a Warriors Orochi 3 Ultimate NSP. This format is commonly used with or emulators .

Warriors Orochi 3 Ultimate (WO3U) on the Nintendo Switch is a massive crossover action game that blends the casts of Dynasty Warriors Samurai Warriors with guest characters from franchises like Ninja Gaiden Dead or Alive SoulCalibur Key Game Features Massive Roster: Features over 145 playable characters Definitive Edition: On modern platforms, it includes over 500 DLC items