Actually I'm glad you bring it up pavned. This is a question I've been thinking to work out how to ask, since it's kind of abstract. But basically what you're saying.
How do the empowerment spells and other effects that use percentage stack? A good example as you gave is the Mana Spring & Stone Skin. If Spring is cast first does the % boost of Skin use the base defense of the unit or does it calculate off of the rating after Spring is added? The thing is there are so many different spells and items and skills and talents and such that add or subtract fixed numbers and percentages the permutations are too vast to try and make a complete list.
So is there a rule that applies to everything? If there are exceptions what are they? I would think one would need to examine the game code to really get a complete and certain answer, or get one of the game designers to give the info.
I would think that each % empowerment would calculate off the base rating and then those numbers would be added together. So it's not like upgrading the Destruction skill as early as possible is a good strat because everything that comes after is calculated from the new figures provided by Destruction.
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