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Benefit

You can use your steal spell ability to siphon psionic energy instead of spell energy. Instead of stealing a spell, you can choose to steal a number of power points equal twice to the maximum level of spell you can steal minus 1 (up to a maximum value equal to the manifester level of the creature struck). For example, a 4th-level spellthief/1st-level psychic warrior could steal up to 3 power points; if he used this ability against a 2nd-level psion he could steal only 2 power points, since that is the target's manifester level. You can use the stolen power points only to manifest a psionic power you already know. You must use these power points within 1 hour of stealing them; otherwise, the extra psionic energy fades harmlessly away. This feat otherwise follows the rules for the steal spell class feature (Complete Adventurer 16). In addition, Knowledge (psionics) and Psicraft are spellthief class skills for you. These skills appear on page 38 of Expanded Psionics Handbook.