4SRD:skin of stone

4SRD > Skin of Stone

Skin of Stone: You have the skin of stone Giantkin racial power.
Your foes’ attacks bounce off your stony hide.
(Swift Action, Personal)
Once per encounter, you can gain a resistance of 5 to all damage until the end of your next turn. (At 11th level you can resist 10 to all damage; at 21st level you can resist 15 to all damage.)