Assassin, Psionic Variant (3.5e Alternate Class Feature)
From D&D Wiki
This class is the same as the Assassin class, except they get psionics instead of spells.
Benefit: Power Points/Day: An assassin's ability to manifest powers is limited by the power points he has available. His base daily allotment of power points is given on Table: Powers and Power Points. In addition, he receives bonus power points per day if he has a high Wisdom score (see Table: Ability Modifiers and Bonus Power Points). His race may also provide bonus power points per day, as may certain feats and items. A 1st-level psychic warrior gains no power points for his class level, but he gains bonus power points (if he is entitled to any), and can manifest the single power he knows with those power points.
Choose the powers known from the psychic warrior power list. (Exception: The feats Expanded Knowledge and Epic Expanded Knowledge do allow a psychic warrior to learn powers from the lists of other classes.) A psychic warrior can manifest any power that has a power point cost equal to or lower than his manifester level.
A psychic warrior simply knows his powers; they are ingrained in his mind. He does not need to prepare them (in the way that some spellcasters prepare their spells), though he must get a good night’s sleep each day to regain all his spent power points.
To learn or manifest a power, a psychic warrior must have a Wisdom score of at least 10 + the power’s level.