Antipsionic Magic( Expanded Psionics Handbook, p. 41)
Your spells are more potent when used against psionic characters and creatures.
Spellcraft 5 ranks,
You get a get a +2 bonus on caster level checks made to overcome a psionic creature's power resistance. This bonus stacks with the bonus conferred by Spell Penetration and Greater Spell Penetration. Moreover, whenever a psionic creature attempts to dispel a spell you cast, it makes its manifester level check against a DC of 13 + its manifester level. The BENEFITS: of this feat apply only to power resistance. The bonus does not apply to spell resistance. This is an exception to the psionics-magic transparency rule (see page 55).
You cannot take or use this feat if you have the ability to use powers (if you have a power point reserve or psi-like abilities).