Earthquake

You shake the ground, topple creatures into fissures, and collapse structures. The GM might add additional effects in certain areas. Cliffs might collapse, causing creatures to fall, or a lake might drain as fissures open up below its surface, leaving a morass of quicksand.

Shaking Ground The ground is difficult terrain, and creatures on it take a -2 circumstance penalty to attack rolls, AC, and skill checks.

Fissures Each creature on the ground must attempt a Reflex save at the start of its turn to keep its footing and avoid falling into 40-foot-deep fissures that open beneath it. The fissures are permanent, and their sides require successful to Climb.

Collapse Structures and ceilings might collapse. The GM rolls a flat check for each ( for a sturdy structure, for an average structure and most natural formations, for a shoddy structure, all adjusted higher or lower as the GM sees fit). A collapse deals 11d6 bludgeoning damage to each creature caught in it with a basic Reflex save. A creature falls unless it critically succeeds and falls into a fissure if it critically fails.

Heightened (10th) You create a massive earthquake that can devastate a settlement. The range increases to half a mile and the area to a quarter-mile burst.