Does Charisma affect enchanters, Dex - necros?

[beentheredonethat]

Hi guys,

I always was wondering this, but never really got a full understanding. Does Charisma affect enchanter spells, or Dexterity for necro spells? And is there some formula which shows how much it affects it if any?

I've heard people say that there is a benefit, but it's very low. Some have said it's a huge benefit. But I could never really get a good concrete answer on how much does it really matter exactly.

Anyone can advice?