[Esther]

I'd honestly like to see it be a main-class-dependent, but not main-class-only, passive for Spellthieves.

"Adaptable Thief, 1 rank, innate

While Spellthief is your main class, you are considered to be a main-classed member of every class for the purposes of determining the power of beneficial status effects stolen from enemies. While Spellthief is your subclass, you gain a median effect from these stolen statuses, halfway between what a main-classed member of that class would receive, and what a subclassed member of that class would receive, for every class except your actual equipped main class."

So main-Spellthieves could steal a full-effect, 30% Wraithguard, as though they were also main-Ghost, but sub-Spellthieves would get a 22% Wraithguard (halfway between 15% and 30%, rounded down to the nearest integer), unless they were Ghost/Spellthieves, who would get the 30% Wraithguard whether they cast it themselves or steal it from an enemy.