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Powerturn (3.5e Feat)
From D&D Wiki
Psychomagic, Turn/Rebuke Undead (or similar ability)
In order to qualify for this power, you must have the ability to turn or rebuke undead, or some similar ability (including the Brahmin's "mystic power" ability or the Spirit Shaman's "chastise spirits" ability). It allows you to channel extra power into these abilities: your level is considered to be two levels higher when determining the effectiveness of these abilities. Alternatively, if you are multi-classed, you can use your normal "turning" level and add half of the difference between this and your overall character level (rounding down) before applying the +2 bonus. For instance, if you're a cleric with 3 levels of rogue and 4 levels of fighter (7 non-turning levels), your turning level increases by 7/2 + 2 = 5. Similarly, paladins and brahmins (who normally turn as a cleric of a lower level) add half of their "missing" turning levels, and character races with racial hit dice and/or a level adjust may count these as non-turning levels. If you also have another feat, ability or item that boosts your turning ability, apply this first, and reduce your remaining non-turning levels accordingly before applying Powerturn.