Changes 22-January-2022:

I recompiled the older versions, so the new files should now all work for 1.7.0
The older versions work for 1.5.5, 1.5.6, 1.5.7, 1.5.8, and 1.5.9

Thanks jj535 and CalicaD for saying that they work in 1.5.8 and 1.5.9.

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This mod makes it so that no nobility/companions will die in the battles you participate in.
There are also different % versions, if you still want some death.
It works off the base game, so if a noble/companion in the base game would die in a battle, then there's now a % chance that they're actually just set to wounded.

You will need the Harmony mod, as it is a dependency:
https://www.nexusmods.com/mountandblade2bannerlord/mods/2006?tab=files

Companions/Nobility may still show up dead in the after battle tally, but check the encyclopedia afterwards, they should be alive and just wounded.
If you are using a % Version, then there's a % chance that they're just wounded.

You can also check your party afterwards, if it was one of your companions etc.

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I just simply changed several lines of code in Fnts mod:
https://www.nexusmods.com/mountandblade2bannerlord/mods/2497

So, absolutely all credit goes to them. Here is their profile. Please go and check them out:
https://www.nexusmods.com/mountandblade2bannerlord/users/5163404

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Changes 14-March-2021:

I added different versions with different percentage chances of survivability after battle. Choose the version that you want! Only use one version at a time and make sure to get the Harmony mod as well and put it (the Harmony mod) at the beginning of your load order.

Basically it is this: If the game says that a noble/companion dies in a battle, they will show as having died in the after battle screen report (when you press tab to end the battle). Then, the mod calculates a chance, let's say you're using the 50% survivability version, then there is now a 50% chance that the character actually survives, and a 50% that the character truly died.

In the regular main version of the mod, all noble/companion characters that die in a battle are instead set to wounded.

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Attention:

If you are you using the Distinguished Service Companions mod, this is taken from Stinkups comment from this discussion forum:

i assume your using the distuinguished service companions mod

you need to take a look inside the settings of the mod. there is a setting that gives your companions an extra chance to die
you will need to set this value to 0, to keep them allive

lost all of my companions, even the old high skilled ones untill i figured tihs out ^^

https://www.nexusmods.com/mountandblade2bannerlord/mods/2497?tab=posts

The Distinguished Service Companion mod may alter the same code, so they will conflict. But editing the setting described by Stinkups fixes the issue, so try what this user suggested!

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Okay take care guys.