Hi Yuyi,
on your suggestions:
1. Slow spell is a mass spell but it doesnt lower speed by 3, it does it by 2. Another thing about mass spells - as I understand it, they cost so much mana, because penalty spells lower your morale by 1 - I am thinking at the moment to remove this, morale will be lowered if you have more then one penalty on your units, no as it is in this moment and lower a little bit the mana, because mana is always insufficient and I almost always spend it on resurrections or sacrifices or divine armors.
2. I know about that bug, when I was testing the mod, I wasnt sure what the numbers after 20%...40% etc is about, I learned that it increases the flow of anger by certain % and adds 1, 2 or 3 rage on top of that. It will stay as in the original

3. I will try to do this, the problem with medals is that not all of them can be modded. I am using the KB compilator and I wanted to give more wide variety of spells to be used with the medals, but it never worked, everything is ok with the mod but if I for example add fire rain to the Fire Mage medal, automatically with the start of the game you gain level III Fire Mage, cannt understand yet why is that, maybe some variables are used that are hardcodded. Another thing I wanted to implement by the medals - to raise by certain % the damage range of units, but this is implemented only on the basic attacks not on special attacks. (this was the reason I put critical strikes for specials too, because with the exception of Double Arrow all other special attacks do a little bit more damage on targets which is fine when you have lower chance for critical hit, but at the end of the game you score criticals with 40-60% chance and it is better to use base attacks and skip special attacks) I am working at the moment to make all items/medals damage variables to work with specials but it needs reworking all scripts