That's the sort of list I'm talking about. Makes the whole thing a lot easier to read and plan out.

And yeah, Scent isn't something humanoids get typically. The idea is something sense-related (blindsight/sense) that would aid them in tracking enemies rather than just fighting them. Scent is just an example of a mechanic that does this job. Maybe just an ability that improves Track? Hell, make an Improved Track feat and give it to Ranger for free.