Man I'm praying that Addendum: Light adds Stoneskin with in SJ lvl.
As was I, but alas, it does not. I wonder if it would be worth trying BLM/SCH now that you can use Parsimony double as often though.
Also, just tested Sublimation as WHM75/SCH37, it has 30 second re-use timer initially (not that that matters), then after 6 minutes (recast broken ;

of -2 hp per tic (assuming it's -2 since I was on whm and with auto regen it was -1), you can then activate it to regain 260 MP. At that point it once again has a 30 second reuse timer meaning you can start the 5 minute cycle again just 30 seconds later. The -2 hp per tic can also be absorbed by stoneskin, as it stands this ability seems pretty insanely good, that's a hell of a lot of free mp for almost nothing.
I assume you can cut it off and activate sublimation earlier to recieve a smaller total of mp restored with 260 being the max if you wait the full 6 minutes. The way they did the icons for this ability is very nice too (definitely a surprise by SE standards). While accumulating the MP store the sublimation icon has a little arrow, and after it's maxed out, the arrow disappears so you know to re-use sublimation to get your mp back.