Instinctive Consummator( Complete Psionic, p. 55)
You always make good on your threats.
Power Attack (PH) , Cleave (PH) , STR 13,
You must expend your psionic focus to use this feat. Whenever you threaten a living foe with a critical hit on a melee attack, you can choose to automatically confirm the critical hit.
All hits that threaten a critical hit must be confirmed with an additional successful attack roll.