freyar
Extradimensional Explorer
dhaga said:Gas Immunity (Ex): A mineral mephit is immune to any gas or cloud effect that deals damage. Stinking Cloud, Cloudkill, and related effects have no effect on the mephit. Obscuring Mist, Fog Cloud, and similar effects that deal no damage but limit range of sight and spotting distance have a normal effect on mineral mephits.
Pass Wall(Su): A mineral mephit can move through stone walls with ease. The use of this ability is limited to walls 1 ft thick or less. A mineral mephit cannot end its round inside a wall.
I'd say those are both about right.