Quote Originally Posted by Gamemako View Post
Abilities rarely have much rhyme or reason as to how they apply. Greased Lightning actually speeds up everything by 15%, but Fey Light/Glow increase the skill/spell speed stat and therefore have a very small effect (and are multiplicative with skill/spell speed bonuses).
The rhyme or reason depends upon what's being buffed, and it's important to recognize what's actually getting buffed since the semantics of what is said is very important: attack speed and skill/spell speed are different attributes, as are attack/spell power and damage/healing. How the bonus is applied is determined by the type of bonus that can be broken into 2 categories: *increases* to a percentile value (like critical hit or evasion chance) and static bonuses are additive whereas decreases to percentage values (what we normally call damage reduction is actually written as "reduces damage taken" so it is a decrease, not an increase) as well as any modifier to an attribute that isn't limited in any way (like the stuff listed on your character sheet) are multiplicative. Debuffs are in the same category as their relevant buffs.

I've yet to see any buff/debuff that doesn't follow these "rules".