srd
SRD
Benefit: You can alter a burst, emanation, line, or spread shaped spell to increase its area. Any numeric measurements of the spell’s area increase by 100%.A widened spell uses up a spell slot three levels higher than the spell’s actual level.
Spells that do not have an area of one of these four sorts are not affected by this feat.
Open Game Content from the System Reference Document 3.5, used under the Open Game License 1.0a.