I’ve been looking for a way to change it for a long time, please help me.
Shinobi is one of the “hidden” classes of the game requiring a pretty long secret quest to unlock, you can find the quest in this google doc
But when you reach the letas stream part you must go to ramstis ridge to find the dissolvent since letas stream was removed from the game in the map reorganization.
Good luck on your shinobi quest hunt.