Accuracy Changed Again?

While we're on the topic of defense, is shield mastery multiplicative or additive? Or rather, would 50 defense + a shield be 50 * 2.00 = 100, or would it be 50 + (50 * 2.00) = 150?

Judging by the skill description, it is (defense + (defense * skill%)) which is triple if you have it maxed.

Also, I have a theory on the accuracy change. Perhaps they removed the square root nonsense since you'd ideally need 625 accuracy to hit Pink Bean which has 625 avoid. With square roots, the chance you hit Pink Bean increases each time you hit a perfect square and not a point sooner. If they remove that, you would improve accuracy with each point.

Just a theory of course.