It doesn't seems to make any diference. What Elemental Amplification makes: all skills will just use more MP to increase Magic att. If I sum all my int + m.att from all my equips, it will give me exactly the same amount of Magic that says in my stats. Showing that Elemental Amplification does not have any participation. Also, the MP that should be decreased by twice, is decreasing normally. Example: Ice Strike decreases 50MP, but, with my Elemental Amplification lvl 19, it suppose to decrease 180% MP which is 90MP. But it's only decreasing 50MP, showing that Elemental Amplification is making no diference. I'm an Ice/Lightening Mage. I don't know if it happening with F/P mages who share the same skill. But I checked with others I/L and they have the same problem. If you are Mage, please, check your total magic att and the amount of MP your skills decrease, so we can confirm the bug.
The description is a bit misleading. It does not increase your base Magic, but it does increase the damage output of all your magic skills. Your attack has gone up even if the Magic is the same.
That's what I thought in the beginning. But when I noticed that the MP wasn't decreasing more than normal, I thought the skill wasn't working. Well, forgive me if I'm wrong. You guys made a great server. Thanks and keep up the work!