Extract Power.
Extract Power (パワーアタック, Pawā Atakku?) is an ability exclusive to the International and HD Remaster versions of Final Fantasy X, found on Auron's section of the Standard Sphere Grid, and between Auron and Tidus's sections of the Expert Sphere Grid. It costs 1 MP to use, and deals physical damage as well as inflicts Distill Power on the target. It costs 20 Mana Spheres to teach to an aeon.
Extract Power replaces whatever item the defeated enemy was supposed to drop with Power Sphere(s). One Power Sphere is awarded for using Extract Power, but two will be awarded for an Overkill. It is not required to Overkill an enemy with Extract Power, as long as the enemy is defeated with an Overkill, the party will get two Power Spheres. If the defeated enemy was dropping Power Sphere(s) for its normal item drop, Power Sphere obtained from the use of Extract Power will be added to the total. The Distill Power status doesn't stack, and inflicting a different Distill status removes the status.