Githzerai Knock

 
Prerequisite(s): Githzerai, Concussion Blast psi-like ability.
 
Benefit: You can expend one or more of your daily uses of the concussion blast psi-like ability granted by your Githzerai heritage to instead gain the use of psionic knock as a psi-like ability. Your manifester level for this will be 1/2 your character level.
 
Source: Complete Psionic