3e SRD:Empower Spell
From D&D Wiki
|This material is published under the OGL|
Empower Spell [Metamagic]
Benefit: All variable, numeric effects of an empowered spell are increased by one-half. An empowered spell deals half again as much damage as normal, cures half again as many hit points, affects half again as many targets, etc., as appropriate. Saving throws and opposed rolls (such as the one the character makes when the character casts dispel magic) are not affected. Spells without random variables are not affected. An empowered spell uses up a spell slot two levels higher than the spells actual level.