Ifrit Oracle (Favored Class Bonus): Add +1/2 to the oracle's level for the purpose of determining the effects of one revelation.
Does it check the "one revelation" each time you take it, or for all levels?
Take a 20th-level ifrit oracle, for example: Could he have a +4 bonus to one revelation, +4 to another, and +2 to a third; or is he limited to +10 in only one?
What about a human fighter, able to add his favored class bonus to two combat maneuvers? Can he choose two different combat maneuvers every level? Or do they always have to be the same two?
Plenty of the favored class options are ambiguous in this way. Hoping to get it cleared up for myself and others.
It is a unique stacking bonus at each level. You freely choose between any/all options each time you level. Each is a choice between all available options. You 'can' choose the same choice for all levels, but it is certainly not required.