Your sense for stonework is uncanny.
Prerequisites: Wis 13, dwarf, stonecunning racial trait.
Benefit: You receive a +4 bonus on Perception checks to notice unusual stonework. This bonus replaces the stonecunning ability's normal bonus on Perception checks. You can intuit where true north lies in relation to yourself (as if you had 5 ranks in Survival) whenever underground. Finally, the range at which you receives a free Perception check for coming near an example of unusual stonework increases to 20 feet.
Essentia: The bonus increase by +2 / Essentia