|benefit=This metamagic can be applied to any area effect spell, leaving difficult terrain in its area effect for 1 round per level of the spell. Creatures passing through the area take 1 point of magic damage per level of the spell as well. For spells with a duration, the difficult terrain remains for the spell's duration + 1 round per level of the spell afterward. A debris spell uses a spell slot +1 level higher than the spell’s actual level.