A crack appears in the ground at the caster's feet and runs for 4D6" in a straight line in any direction in the caster's arc of sight. Any models in its path must make an Initiative test to leap out of the way. Models that fail are removed as casualties. Instead of taking an Initiative test, war machines and chariots must instead roll a 5+ or be destroyed.

A building (or single section of multi-part building) affected by the spell will collapse on a roll of 5+. If the building collapses, any models garrisoning it must pass an Initiative test, or be removed as a casualty with no armour save allowed. Any survivors are placed outside the building, as described for a unit abandoning a building. Then replace the building with an area of dangerous terrain of equal size.