Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Mods What is and isn't possible with a mod?

I know absolutely nothing about making a mod, but I want to change my game in some specific ways in order to maintain challenge and my enjoyment throughout the campaign. So, can anyone tell me if the following can be currently achieved through the use of a mod? (I'm not asking someone to create something for me, just wondering if these are possible before I attempt to learn.)

Modify base resistances on player characters to a negative number.
Modify health gains on level-up and/or per point of con.
Modify abilities to use chance to hit.
Modify the base cooldown of abilities.
Modify ability cooldown formula regarding primary attribute (require more int to lower cooldown, modify str and dex to do the same).
Modify AP cost of abilities.
Modify required character level and/or skill rank of abilities.
Modify talent effects (add resistance & armor penalty to glass cannon, make Bully usable on other debuff conditions, etc).
Modify ability effects (include additional bonuses/penalties to attributes/skill level/AP/armor/resistances to abilities that don't currently have those effects).
Modify debuff states to do something completely different (replace current Blind debuff effect with penalty to hit chance and ability range, give Burning a chance to fear, give wet/chilled a movement reduction, make Frozen/Stunned/Knockdown break on damage, etc).
Add bonuses/penalties to existing gear via crafting (craft a magic skull on your armor to add +1 con, etc).
Add more random variations to crafted/blacksmith weapons in addition to existing results.

I'm guessing a lot of these are built into the engine and can't be modified, but since I know nothing I thought I would at least ask. Thank you for any guidance you can provide!

Possible via Data\Character.txt:



This was hardcoded in EoCApp.exe in the beta, I believe it still is.


Not sure about this one


Possible via SkillData.txt:



I believe this is hardcoded.


Possible via SkillData.txt:



Level requirement is changeable, skill rank I'm not sure about:



Talent effects are hardcoded, talent requirements are changeable via Data\Requirements.txt:



Possible via the various settings in SkillData.txt.


Possible via SkillData.txt.


Possible, you need to change crafting recipes in ItemCombos.xlsm and/or the item modifiers in Data/DeltaModifier.txt.


Possible, crafting recipes are in ItemCombos.xlsm.

Thank you so much for your detailed reply, I really appreciate it.
Time for me to get crackin' now...