You raise or lower a column of rock from the ground.

Encounter   ✦     Arcane, Elemental
Minor Action      Ranged 5

Target: One square of stone, mud, or dirt

Effect: You cause the target square to rise up to 20 feet or sink up to 10 feet. If you raise the square, the area below it is filled with solid rock and becomes blocking terrain. Creatures in the target square can shift 1 square as a free action to avoid being raised or lowered. This power cannot be used to harm a creature, and any such use causes the power to fail. The target square remains at its new elevation until the end of the encounter.

Published in Heroes of the Elemental Chaos, page(s) 92.