Type: Metamagic
Source: Player's Handbook II
Your spells that use cold and ice to damage your foes leave behind a thin layer of slippery frost.
Benefit: This metamagic feat can be applied only to spells that have the cold descriptor and that affect an area. A flash frost spell deals an extra 2 points of cold damage per level of the spell to all targets in the area. When you cast such a spell, the area of the spell is covered with a slippery layer of ice for 1 round. Anyone attempting to move through this icy area must make a DC 10 Balance check or fall prone. A creature that runs or charges through the area must make a DC 20 Balance check to avoid falling. A flash frost spell uses up a spell slot one level higher than the spell's actual level.