Choose one of your spell-like abilities (subject to the restrictions below) to use at a heightened level up to three times per day (or the ability's normal use limit, whichever is less). The spell-level equivalent of the heightened spell-like ability is two higher than its normal level (to a maximum of 9th level), with all effects dependent on spell level (including saving throw DCs) calculated at the higher level. The spell-like ability you wish to heighten can be chosen only from those abilities that duplicate a spell of a level less than or equal to 1/2 your caster level (round down), minus 2.