You can leverage your concealing amorpha psi-like ability to gain greater control over your own body.
Prerequisites: Githyanki, concealing amorpha psi-like ability.
Benefit: You can expend one or more of your daily uses of the concealing amorpha psi-like ability granted by your githyanki heritage to instead gain the use of ectoplasmic form as a psi-like ability. Your manifester level for this effect is equal to ½ your Hit Dice (minimum 1st).
Source: Complete Psionic, page 54.