talmar said:impact, weapon special ability, magic of faerun, p140
impact, weapon special ability, arms and equipment guide, p97
In 3.0 psionics, the Impact weapon special ability provided +2 damage in addition to enhancement bonuses for a +1 bonus price. In 3.5 psionics, this appears to have been replaced by the Collision weapon special ability, which provides +5 damage for a +2 bonus price. The wording for each ability is very similar. Perhaps the Mind's Eye designers have been confused by the 3.0->3.5 change?