Hi!
This mod allows players to adjust the Attack, Defense, and Constitution stats directly from the CoreUnitStats.xml file, applying said changes to all Kingdom and Empire units universally, including Sovereigns.
Note that weapons and armor will add to these base values.
In addition, Any changes to Attack and Defense will also affect Sovereign Attack and Defense stats.
Incidentally, Pioneers and Peasants will now have the same Constitution stat as everyone else.
The Sovereign's base Constitution stat of 10 will not be affected by changing the CoreUnitStats.xml file. The default Con for all units is currently set to 10 (feel free to change to 5 or any other value as you wish).
Incidentally, I deleted the Essence stat adjustments from the stats of the various Kingdom/Empire Core Units, seeing I was there at the time...
Known 'issues' so far:
Sentinels will not receive their +1 bonus to defense, and their Con will be the same as other units.
Level 10 Milestones for various units does not add +2 (or any value) to the attack value.
Monsters and other Unique Creatures are not affected by this mod, so they will not benefit from adjustments to the CoreUnitStats.xml values.
Currently, I left the other stats (Intelligence, Charisma, etc.) alone, as different units have different values and I didn't want to mess with those at the moment.
Also, I ended up having to put all 13 files directly in the My Documents/Gaming/Elemental/Mods folder. The system wasn't seeing the files in the subfolders for some reason (suggestions?).
NPC's have not been incorporated into this mod as of yet. Next release...
This is my first posted mod for Elemental, so be gentle... 
Thanks to Werewindlefr for giving me the courage to tackle this mod! This ties in with his Railguns Balance 'mod' that he has been working on, and hopefully this makes his and everyone else's testing with various Attack, Defense, and Constitution values a little easier.
Any feedback r.e. bugs, etc. that you come across relating to this mod will definitely be appreciated.
Download zip file here: CombatBalance0_1a.zip