Status: Enchant Blade
Equipment: Buwaya Agimat Tattoo for Matk % increase observation
Requirement: Have EB buff
From the tests MATK % doesn't add anything to EB damage currently. Any relative MATK % (bMagicAddRace,RC_NonBoss,n; bonus2 bMagicAddRace,RC_Boss,n) should influence Enchant Blade damage. This should include Elemental and Racial Mods since they are pretty much the same thing.
Images 3 & 4:
3. I wore a alchemy glove (+1int) to see that my damage rose from 1622 to 1626.
4. Wearing bradium earring (+1 int, +2% matk), I noticed that my damage rose to 1633 instead.
Conclusion B: Enchant blade is also increased by % matk gears.
iRO SS: http://imgur.com/a/xhAoJ
Base Damage: 1622
Damage with +2% MATK (Bradium Earring): 1633
This shouldn't include the bonus damage from INT.