Element Amplification and the new skill Magic Mastery (4th job mages, revamp patch)

This might be going a bit off topic for you, but I thought I'd address it here anyway:

First of all, after BB a multiplier on MA and a multiplier on damage are very similar because both are a multiplier on INT and LUK. However, a multiplier on MATK and a multiplier on damage are not the same thing and, as such, they cannot be added together. A multiplier on MA is slightly worse than a multiplier on damage overall because flooring MATK hurts more than flooring damage.

For example:

If you have 293 MATK, 100 INT, and 100 LUK

15% bonus to Magic Attack:
MATK = 293 * 1.15 = 336.95 = 336
Max Damage = (4 * 100 + 100) * 336 / 100 = 1680

15% bonus to damage:
MaxDamage = (4 * 100 + 100) * 293 / 100 * 1.15 = 1684

So you can't add overall +% damage (Amp) and +% MATK (Magic Mastery) because they aren't the same calculation.

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Anyway, it's disputed whether Magic Mastery gives +20% MATK or +20 MATK.