I'm thinking only about the major faction daymios who have their own entry in the unit.tables.
Is there a way to have them get this immortality trait like main faction leader like Napoleon have in NTW, or like Caesar, Vercingetorix, Hannibal in Rome 2 ?
Instead of getting killed in battle they would just be hurt and be respawn in capital. They would only be killed if their capital is taken.
Also, they would noyt be killable by ninja supermen.
It exist in the game before and the one game after (NTW and R2TW), because of the engine similarities I thought it might be possible !