Gruesome Riposte (10th level)

The material below is Open Game Content by a 3PP Source

Gruesome Riposte: The soulknife may expend her psionic focus as an immediate action to attack an enemy who has successfully struck her in melee. This attack is assumed to happen after the successful attack, so she cannot use this ability if the attack would put her below 0 hit points, nor does dropping her enemy below 0 hit points prevent the attack from hitting. A soulknife must be at least 10th level to choose this blade skill.