When should WHM use Stoneskin I?

[KisaiTenshi]

Just a small correction here because of the fact MP effeciency is important to a WHM therefore it's important to use correct values.



Kisai probably just accidentally compared the MP values of Stoneskin II versus Cure III instead of Stoneskin to Cure II.

I actually got it from here http://www.ffxivinfo.com/class/conjurer.php which Cure III and Stoneskin say 399MP at level 50.
Stoneskin II is 532MP and applied to X many players in the party, so if you have 4 players it's as efficient as one proactive Cure I (4 x 133MP) on each of them, and if you have 8 players it's twice as efficient. But you can't cast it during battle so it's moot.