Your powers with the force descriptor knock the affected creatures prone.
Benefit: To use this feat, you must expend your psionic focus. The impact of your force power is strong enough to knock the target prone. If the target takes damage, fails its saving throw, or is moved by your force power, make a trip check against the target, using your manifester level plus your manifesting ability score bonus (Wisdom for psychic warriors, Intelligence for psions, and so on). This does not provoke an attack of opportunity. If the check fails, the target cannot attempt to trip you or the force effect in response.
A toppling power only affects powers with the force descriptor. Using this feat does not increase the power point cost of the power.