The creature can use a spell-like ability with greater effect when on its native plane.
Benefit: Choose one of the creature’s spell-like abilities, subject to the restrictions below. The creature can use that ability as a native spell-like ability three times per day (or less, if the ability normally usable only once or twice per day). When a creature uses a native spell-like ability while on its home (or native) plane, the spell-like ability has an effective caster level of one level higher. All effects dependent on the spell-like ability’s level (such as saving throw DCs and ability to penetrate a lesser globe of invulnerability) are calculated according to the increased caster level. Creatures native to the Material Plane gain no benefit from this feat. The creature can only select a spell-like ability duplicating a spell with a level less than or equal to half its caster level –2.
For a summary, see table below.
Special: This feat can be taken multiple times. Each time it is taken, the creature can apply it to a different one of its spell-like abilities.
Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games.