Needs review
Source: Book of Vile Darkness

Description: The creature can use a spell-like ability with greater effect.

Prerequisites: Spell-like ability at caster level 6th or higher

Choose one of the creature’s spell-like abilities, subject to the restrictions below. The creature can use that ability as an empowered spell-like ability three times per day (or less, if the ability is normally usable only once or twice per day).

When a creature uses an empowered spell-like ability, all variable, numeric effects of the spell-like ability are increased by one half. Saving throws and opposed rolls are not affected. Spell-like abilities without random variables are not affected.

The creature can only select a spell-like ability duplicating a spell with a level less than or equal to half its caster level (round down) -2. For a summary, see the table in the description of the Quicken Spell-Like Ability feat.