I changed the Spell Mastery [SM] skill to be used as % of spell parameter improvement, you can read in more detail here:
http://www.ironcrown.com/ICEforums/index.php?topic=8115.20But I have found mainly 2 problems:
- 1) Maybe it truncates in excess the progression, OK that an effect x4, x5, etc. is too much powerfull, but I think it should has a bit more extension.
- 2) Players can abuse, developing only 1 rank you have a good bonus by profession and stats bonuses. At this moment I have no problem with this because players know that if there is abuse, it will takes few time to be changed.
In any case, I think that it could be a good change use, only for the auto-SM purpose, only rank bonus (like adrenal defense), but using a special progression, and is this progression what I need to contrast with opinions to find balance.
There are many possibilities, like using 5-5-5-5, in other words, +5 per rank, 5-4-3-2, 5-5-4-3, 5-4-4-3, really many, but IMO the last number should not be lesser than 2 in any case.
As orientation, in our system we changed the progression so the last number is not lesser than 1, so the combined is 5-3-1,5-1 and the standard is 3-2-1-1 (the category is not changed, there is a limit for all-skills category development). We think is not good for player's mood adquire ranks with +0,5 for increase the skill bonus.