Psychic Strike (Su) As a move action, a soulknife of 3rd level or higher can imbue his mind blade with destructive psychic energy. This effect deals an extra 1d8 points of damage to the next living, nonmindless target he successfully hits with a melee attack (or ranged attack, if he is using the throw mind blade ability). Creatures immune to mind-affecting effects are immune to psychic strike damage. (Unlike the rogue’s sneak attack, the psychic strike is not precision damage and can affect creatures otherwise immune to extra damage from critical hits or more than 30 feet away, provided they are living, nonmindless creatures not immune to mind-affecting effects.)
A mind blade deals this extra damage only once when this ability is called upon, but a soulknife can imbue his mind blade with psychic energy again by taking another move action.