Hmm, something seems wrong here.
I did some tests with Blaze Shield and Exploding Dragon, both with weapons/charms and without weapons/charms.
http://imgur.com/a/g3McH (Forgot to include shot of stats without weapons: http://i.imgur.com/1qYI9hv.jpg)
Now, according to the iROWiki:
Fire Charms increase damage inflicted with fire element ninja skills:
Flaming Petals: +20% per charm (+200% with 10 charms)
Blaze Shield: +5% per charm (+50% with 10 charms)
Exploding Dragon: +15% per charm (+150% with 10 charms)
Now I know Flaming Petals' bonus from the charms is added together to its usual 90% MATK * 10 hits for 290% MATK * 10 hits. I didn't get a screenshot of using it, but the damage went from around 6900~7900 (with weapons, without charms) to 22500~23200 (with weapons, with charms).
But Exploding Dragon's bonus seems to just be tacked onto the normal 900% as the skill is first calculated as one hit and then afterwards divided by three and rounded down when dealing damage. So now instead of something like 900% + (150% per hit) (for 1350% total) you have a simple 900%+150% for 1050% total damage.
I don't even know what's up with Blaze Shield. It seems to be doing a lot more than 50% (base) + 50% (Charms) MATK per hit. Could the charm effects for Blaze Shield and Exploding Dragon have been wrongly switched in-game or on the wiki?
I certainly didn't do the most rigorous of testing here, but it'd be nice to have an official formula from a GM or something for how all of the charms affect the magic skills.
Personally, I wouldn't mind seeing the bonuses just become more of a multiplicative bonus on the end damage. So Flaming Petals' final damage becomes 100%+200% for a total of 3x final damage (tripling the 900% total damage, effectively making it a 2700% skill. nerfed a bit from the 2900% it is now). Blaze Shield's final damage becomes 100%+50% for a total of 1.5x final damage (so from base 50% to 75% with charms, another nerf). And Exploding Dragon's final damage becomes 100%+150% for a total of 2.5x final damage (turning the 900% base into a 2250% with charms; a buff from what it is now with charms).
Hell, I don't know. It's all a janky mess to me.
Edited by aikokun, 20 October 2013 - 05:55 PM.