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Okay, let's say...
If skills and abilities can be changed, it's only by modifying certain numerical coefficients in the \GameMechanics\RPGStats\DefaultStats.xdb file. If something isn't there, it's likely that the ability/skill is hardcoded into the game engine.
Creature stats are located in \GameMechanics\Creature\Creatures\.......
Heroes are located in \MapObjects - in the faction folders, you'll find heroes mixed in with creatures. The hero names don't match the file names, so you'll have to check each one individually.