Gravelwalker
Region
Requirement(s): Darklands, usually under warm mountains
PFS Legal: No
Source: Kobolds of Golarion, pg. 9
Having grown up navigating rockslides and picking your way through partially collapsed tunnels, you are able to determine the most stable path across difficult terrain caused by rubble or other debris. You can move normally through such obstructed spaces, and can run or charge though them with a successful Acrobatics check.