how to change/add/making a new attribute to a Unit?

[Zaridan]

i would like to know, i want to make some units slow and few yet powerful and dangers.

the main thing i would like to see them not do is stagger when facing units weaker/numures then them.

[Johannes Kurkuas]

Ok, did you unpack your medieval Files?
If not, run the unpacker in your medieval directory.
When finished, delete the descr_geography file in the Data Folder
Then open Data/export_descr_units and you'll see an entry for each Unit.
Now you have to try little with the Attributes/morale entries to your wish
After that Save, go to the main Directory, open the medieval.preference file and Write at the bottom:
[io]
file_first = true

Start the Game and you can see the Changes you made ...

[Zaridan]

that helps me out at the most, thanks.
but what about making a new Attribute for the units? while i can make them do heavy damage and last longer, i don't know how i can force them to ignore staggering. or ignore range damage completely*

*(Unless i make the shield points very high witch will be stupid when i'm gonna work on a magic part for my case as well.)