Svirfneblin Racial Utility 6Deep Senses
You extend your mind into the stone, and you feel it shift and reverberate with the motion of your enemies.
Minor Action Personal
Effect: You gain tremorsense 5 until the end of the encounter. Once per round, you can spend a minor action to increase the radius of the tremorsense by 1 (to a maximum of 10).
Published in Into the Unknown: The Dungeon Survival Handbook, page(s) 50.