As a standard action, a saxra can cause splintered bones to erupt from all terrain (except worked stone or open water) in a 100-foot radius. Any creature moving across this area takes 2d6 points of piercing damage and 2d6 points of negative energy damage for every 5 feet of movement, and must succeed at a DC 30 Reflex save or have its land speed reduced by half for 10 minutes. The bones remain and continue to deal damage indefinitely unless someone removes them manually (taking 10 minutes of work for each 5-foot square) or the saxra uses this ability again. The save DC is Charisma-based.