It seems altering the SkillData.txt may sometimes cause big problems for a player's game. Maybe it was a fluke. If someone reads this sometime in the future it might alread be fixed for you.

First I will cover what I did to SkillData.txt

****Here are the changes I did to the SkillData.txt****
I altered the SkillData.txt (using the XLSM and the All.xlsm) on my Source Difficulty Mod for version 1.03 and 1.04

I altered it so Staff of Magus would take 3 AP instead of 4 and I altered Enemy Heals to work for only one turn, take a 20 turn cool down, and altered its power from I think 30 to 100.

I have no other mods installed.

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So the Staff changes work, but the value when you hover over it changes only when a person equips the staff.

The enemy heal worked perfectly it appeared like.

****Now here is the Important Part****

So I had a save file for over 3 hours and there hasn't been any new game update or mod update in that time.

1) First Bug
Then the next day when I loaded a saved game suddenly all Skill descriptions were removed including those of SkillBooks. I didn't find any other problems though.

2) Second Bug
A user that tried my mod said that when starting a new game certain Scoundrel Skills now required strength (razor's edge required 7 to be exact). The fact that it altered more than 1 skill means there might have been some value jump somewhere?

I tried to repeat this bug various times and for me it occured 2 times in 20 New Game attempts.

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My conclusion is either this was somehow a fluke caused by the 1.03 and 1.04 version of my mod, one of the changes I did (Maybe I screwed up somewhere) to SkillsData.txt, or maybe it has a chance of breaking the game randomly when loading the file in game.

Because of this I removed the SkillsData and its changes from my mod to be sure.

If someone plans on modding SkillsData.txt and you might be worried about this you can download version 1.04 of my mod and check through both its XLSM and TXT files I left there. Maybe it was just a mistake I made somewhere.

Hopefully anyone planning on messing with SkillsData.txt will see this and plan their mods out better.