Subbing SCH skill differences vary with main job.

[Vyvian]

Everything I've read indicates that using Light/Dark arts raises the respective skills to B+ (256), but this doesn't seem to be true, it appears to vary by your main job.

WHM75/SCH37 Base
Healing 286 (276 + 10 from merits) ;; Divine 269
Enhancing 230 ;; Enfeebling 236 (220 + 16 from merits)
Elemental 101 ;; Dark 101

After Light Arts:
Healing 286 ;; Divine 269
Enhancing 256 ;; Enfeebling 272 (256 +16)
Elemental 101 ;; Dark 101

After Dark Arts:
Healing 286 ;; Divine 269
Enhancing 230 ;; Enfeebling 272 (but note this is still 256+16)
Elemental 246 ;; Dark 246
-------------------------------------------------------------
Had a friend try out blm75/sch
Healing 101 ;; divine 101
enhancing 200 ;; enfeebling 230
dark 285 (269+16) ;; elemental 292 (276+16)

Light Arts:
Healing 246 ;; Divine 246
Enhancing 246 ;; Enfeebling 256
Dark 285 ;; Elemental 292

Dark Arts:
Healing 101 ;; Divine 101
Enhancing 200 ;; Enfeebling 256
Dark 285 ;; Elemental 292
--------------------------------------------------------------
So for the heck of it I pulled out my 75mnk/sch
Bases
Divine 101 Healing 111 (10 from merits)
enhancing 101 enfeebling 117 (16 from merits)
Elemental 101 Dark 101

Light and Dark arts set the respective skills to 246 before merits

So apparently, having enough skill in a category actually grants it a +10 bonus from an Arts making it B+, but the ability itself doesn't give B+.

Im not sure what the exact conditions are, it isn't necessarily natural job skills, because blm technically does have a natural enhancing magic skill.

Taking a guess at SCH skill levels, perhaps you need 210 natural skill or higher to get this +10 skill bonus from an Arts, but the end result still needs to be higher than your natural base or the arts won't affect that skill (ie healing on whm).

[Vyvian]

On a further note, I had a friend try Light arts on PLD
Base caps 256 divine, 225 healing 210 enhancing

Light arts made all 3 256, while it made the 200 base of blm only a 246, so something about 210 or more seems to be important.

[Tormentormike]

http://wiki.ffxiclopedia.org/wiki/Light_Arts

# If your main job skill is 0-200 at level 75, it is raised to 246 (Or Current Level Cap for B+ For Jobs Lower Than 75)
# If your main job skill is 210-250 at level 75, it is raised to 256 (Or Current Level Cap for B+ For Jobs Lower Than 75)
# If your main job skill is 256-276 at level 75 it has no effect.

[Kriz]

You merited Healing Magic?

[Atreides]

You merited Healing Magic?

kinda unrelated but has anyone done any testing of the rumor that higher healing magic skill increases the chance for cursna to remove doom status? I'm pretty reluctant to believe this but yeah.

[Lyramion]

Bitching at your melee for not bringing holy water is more fun tho

[Kriz]

You merited Healing Magic?

kinda unrelated but has anyone done any testing of the rumor that higher healing magic skill increases the chance for cursna to remove doom status? I'm pretty reluctant to believe this but yeah.

It's hard to test nowadays, no one merits in U.Range anymore.

That, and a paltry +3 earring available for Sacrarium means no real easy way to test. I will tell you that Divine Seal + Elemental Seal stacked doesn't work, hah. I assume Benediction does though, so it is just an issue with resist.

Though a WHM could get +60 skill from gear (15 AF1 hands, 15AF2 legs, 5 sea cape, 10 pole, 7 torque, 3 earring, 5 Nashira). So 276+60= 336 and then, I guess, you could merit that to 352... I guess it's worth a shot, cause that's a pretty large difference than naked skill.

Oh, and then toss Magic Accuracy on the rest of the slots!

[Ashira]

You merited Healing Magic?

kinda unrelated but has anyone done any testing of the rumor that higher healing magic skill increases the chance for cursna to remove doom status? I'm pretty reluctant to believe this but yeah.

I remember trying this out and maxing out healing skill for a while for Cursnas, when we used to merit in Ule quite often. I never really got better results out of it, though of course it wasn't any huge sample that would be considered significant. Now I have my fastcast/recast shit on so I can spam it faster and hope something lands. /shrug

[Eldelphia]

I have no luck in Sacrarium/ Aqueducts with Doom but have more reliably managed to remove it in Dynamis. I realise some peeps narrowly avoid but this is actually removing it. I have no healing magic merits and don't macro in anything as yet (I don't really have room... for one spell). I have no clue why