Hey,
I want to modify the Damage from Murderers so that they are nearly immune against shots in there Body or Arms and Legs.
So that they can almost be killed with Headshots. Is there a way to include it?

I will have to research this and get back to you.

Merged post

you might want to try with this plugin, it seems to do most of what you want to do other than it being based on who is being hit:
https://umod.org/plugins/individual-damage-controller
He is a very good plugin developer who write amazingly good code.  That seems the more logical place for this to be done.

But if i change the Damage for Headshots this is for all NPC's or not? I only want to do this for Zombies :)

You would need to request he tune it per target type.  He has 95% of the code needed to do this already there.  I have none of it.