How to modify to your taste:

You will need Pack File Manager (PFM) https://sourceforge.net/projects/packfilemanager/

- Open the mod via PFM, go to unit_stats_land_tables;

- Select the unit you want and go to "man_entity" change it to "mono_hero_ent" and the unit will be nearly invincible. If you find this too much work, just change the "man_health" column to something like 999, 9999 or whatever, it'll work.

- On the upper left corner click File > Save and it's done.

(It also applies to AI, so be careful if the unit is recruitable by everyone)



- Open the mod via PFM, go to units_to_exclusive_factions_permissions_tables;

- It is an empty table right now, so you can simply add an entry by clicking "Add Row";

- Now there are 3 columns: Key, Faction and Allowed;

- Key: This is the unit key that refers to the unit you want. You can go to units_tables or unit_stats_land_tables and look for the Key you want. The easy way is to simply click over the Key box of the unit you want, and press CTRL + C to copy, then go back to units_to_exclusive... and paste the Key;

- Faction: the faction which will have exclusive right to the unit. quite simple really: oda, shimazu, takeda; uesugi, ikko_ikki; chosokabe, date; no caps. You can open data.pack with PFM to see the factions if the one you want is not here (same tables should work).

- Allowed:mark the checkbox (or type "True"). This will ensure that the exclusivity will work.

Note: you can add multiple rows for more units or for different factions in case you want immortal heroes for you and your planned ally.

- On the upper left corner click File > Save and it's done.


- Open the mod via PFM and go to "buildings_units_allowed_tables"

- Each hero has one entry for each building level (castle 1 through 5 and sword school 1 through 4);

- You can make each (or all) exclusive to faction by adding the faction name on the faction column and marking the checkbox column "unknown" or typing "True" --- This will make the hero only recruitable by that faction, having that specific building, so you have to make it to all entries of the same unit, or else you'll only be able to recruit the hero with a "sword school lvl 1" and as soon as you upgrade it in the campaign, the hero will be unavailable.

- On the upper left corner click File > Save and it's done.

Not a very simple method, too much work in my opinion, but it may allow for further customization if you want it.

That's about it. Any questions, feel free to ask.