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PFS StandardTerraforming Trickery [one-action] Feat 12

Concentrate Earth Sorcerer 
Source Player Core 2 pg. 156

You know how to channel the transformative aspects of your blood magic to alter your surroundings. You know the following blood magic effect.
Blood Magic—Terraforming Trickery Either each space adjacent to you becomes difficult terrain, or each space adjacent to you is no longer difficult terrain. This doesn't have any effect on greater difficult terrain and doesn't remove the damaging effects of hazardous terrain.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.

Earth:

Effects with the earth trait either manipulate or conjure earth. Those that manipulate earth have no effect in an area without earth. Creatures with this trait consist primarily of earth or have a connection to magical earth.

These planes are mostly solid. Travelers arriving upon an earth plane risk suffocation if they don’t reach a cavern or some other air pocket within the plane’s solid matter. Creatures who can’t burrow are entombed in the plane’s substance and must attempt to dig their way toward an air pocket. Air creatures are ill at ease, as they rarely have the space to move freely through even the loftiest warrens.