Aristocracy is a tuning fork-like Ethereal Blade. It seems to be a bit longer than some of Xemnas's other ethereal blades, and has a small lens-shaped gap in the thick part of the blade just before it splits into two prongs of equal length. It glows white.
Upon striking targets, the blades create a circular, blue-green impact effect. Combo finishers create a larger effect.
"Aristocracy" is a form of government which is ruled by those considered superior to others.
For Aristocracy's ground combo, Xemnas whirls forward, slashing with both hands and ending with a right thrust, thrusts with his left blade, which extends a long distance, thrusts with the right hand, and finishes by launching three blades forward at once, in a spread pattern with knock-back.
For the aerial combo, Xemnas raises his blades and throws them down in a line in front of him (continue attacking to extend this attack), raises them again and throws them down in a burst with an area of impact and a knock-back effect.
The attack combos for Aristocracy+ build on the ones for Aristocracy. The ground combo adds another left thrust and another right thrust before the finisher, and the air combo finisher, instead of firing the blades with an area of impact, fires them in four concentrated spots, in a diamond pattern.