Source: Psionics Handbook
You can punish psionic attackers
Prerequisite: Psychic Bastion
Benefit: You deplete a number of power points equal to 10 + your Charisma modifier from your attacking opponent on any psionic attack that deals 1 or more ability damage to you. Against freely manifested attack modes, Mind Trap deals back ability score damage equal in type and amount to that dealt to you, plus an additional 2 points. Your opponent cannot raise defense modes against this damage.