You gain resist acid 5.
Feats Compendium
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Whenever you score a critical hit against an opponent with a spell that requires an attack roll, you may immediately attempt to trip your opponent as a swift...
You can see through stone, earth, or sand as easily as if it were transparent crystal.
You can pass through stone, dirt, or almost any other sort of earth except worked stone and metal as easily as a fish swims through water.
As a standard action, you can charge and throw a pebble (or other stone of similar size) that detonates when it strikes a target as a ranged attack.
You are an accomplished rock thrower and have a +1 racial bonus on attack rolls with thrown rocks.
As a swift action, you can cause jagged pieces of stone to explode outward from your body.
As a standard action, you can harden your flesh so that weapons that strike you are damaged or destroyed.
You receive a +4 bonus to your Combat Maneuver Defense when resisting a bull rush or trip attempt while standing on the ground.
As a standard action, you can perform a melee touch attack that deals 1d6 points of acid damage +1 point for every two oracle levels you possess.