This spell cast be cast upon an enemy unit that is within 12" of a river, stream, bog, or any other water feature on the tabletop which has been identified as such before the game. If there are no such features in range, it can be cast on it enemy unit within 6" of the caster. It cannot be used against a unit that engaged in close combat. If successfully cast, the ground beneath the unit is turned to swamp and the unit moves at half speed until the end if its own following turn. If forced to flee, for whatever reason, the unit flees at half speed. This spell has no effect on flyers or ethereal creatures.

The swamp disappears at the end of the opposing player's Magic phase.