@ShuiMienLung
It`s nice idea, but not really possible in this mod. Matt changed mana/rage inflow here so at round 20 all mana/rage is 0 no matter how much mana spring you use it just wont give you anything in return when enemy hit that unit, or making any amount of dmg wont give you new rage after 20th turn. So what you accumulated up until then, has to be enough. It makes sense, the longer battle is your/enemy troops are more tired and less angry (rage) so it`s great feature of this mod.
Also some rage spirit skills are changed, poison cloud among them so now it makes higher area dmg then before, but 2000-4000 dmg, 1/2/3 attacks at max lvl for 70 rage. Even in original game setings i dont remember how many time i cast poison cloud just to see if flying around arena dmging my own troops and never even touching enemy army

Give it a try ShuiMienLung , ask Matt to send you mod files and have fun. He said he`ll start working on changing mod for armored princess soon. I guess just when he finishes if, new KB-WotN game will get out so he can start on adaptation for it also (there are going to be valkyris so marrying them and having kids will be same as here)