Incursion

Did a little testing. This only (seems) to happen when you've got an animal companion -- more specifically, the spell doesn't seem to 'stick' on the companion, instead becoming, well, truly permanent for you. Attempting to dispell yourself does nothing, while dispelling your companion _does_ give a 'some of X's magic was dispelled' message, though it doesn't get rid of the fog. Companion also snaps on you, naturally, and killing it does nothing to the spell's persistance.

/Gust of Wind/, at least, gets rid of the cloud bank as it should -- of course, it's not on the ranger spell list.

When it's just you, the spell works as it should.

Note that mounting your companion (if possible) and z-resting _while mounted_ caused the effect to disperse as normal... once. _Only_ once, for some ungodly reason. Note that just 'x' cancelling it does not, as per above.

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As to nature sense, there's several things that can grant it -- lenses of the druid, librams of hidden secrets (reading two, or one while you posses See Invisibility), at least one of the gods, to start. Deeper, penetrating sight amulets or rings can render the issue moot as well. Multi-ing into druid (2nd level grants nature sense), naturally, works, as does certain clerics (the weather domain grants nature sense at first level. Hesani and Sabine (and possibly the Multitude) offer it.). For now, it might simply be best to avoid learning /obscurement/ untill you've got a way of dealing with it yourself -- not the best option, but the dev cycle doesn't start back up for a few more months.