Blaze-Moon

Hello! So, it's been too long since I last ran the Ninja quest line and I don't really have an alt at this time to pull through it nor can I find a database of the quest line's dialogue outside of the actual cut scenes. If this has been asked before, I apologize -- my searching skills are weak -- but can anyone inform me on anything you know about the ninja job in-universe? All lore-based information is helpful! Traditions, how ninjitsu works, impact/use of soul crystal, origins, etc.