You can increase your chance of success in psionic combat.
Benefit: You may add up to half of your manifester level as a modifier to the defender's Will save DC for psionic combat when you pay the cost of +3, plus +2 power points per +1 DC modifier. You must pay this cost prior to determining the failure or success of the psionic attack. For example, a 13th-level psion selects mind thrust in psionic combat and adds half his manifester level (+6) to the Will save DC. He pays 15 power points to use this feat.