Source: Dragon #346
You speak your foe's truename to make him susceptible to your spells.
Prerequisite: Truespeak 9 ranks, Named Spell.
Benefit: You can make a Truespeak check to say a creature's personal truename. Until the end of your next turn, the DC of any spell you cast increases by +2 for that creature and you gain a +2 bonus on caster level checks to overcome that creature's spell resistance. The level of the spell does not increase. This bonus stacks with other bonuses on spell DCs and caster level checks, including the ones from Named Spell, Spell Focus, and Spell Penetration.
Special: You cannot apply this feat to spells that have area effects or more than one target.