You stride through earth or stone as if it isn't there.

Encounter   ✦     Arcane, Elemental
Move Action      Personal

Effect: You move up to your speed. During this movement, you can pass through stone, rock, sand, or earth, and you have tremorsense 1. If you end this movement inside solid earth, you immediately move to an unoccupied square nearest your entry point.

Published in Heroes of the Elemental Chaos, page(s) 93.