Annihilation is shaped like an elongated oval. It has a large, teardrop-shaped gap in the middle of the blade. The outer edge of the weapon is completely lined by short spikes, and there is a longer, thinner spike near the tip of the blade that descends into the gap. This Ethereal Blade is black and glows red.
Upon striking a target, the blade creates an X-shaped slash effect in an orange bubble. When landing a combo finisher, the effect becomes bigger and the X is crossed with another slash.
Annihilation is the act of reducing to nothing, which happens to be Xemnas's attribute.
Annihilation's ground combo is long and elaborate, and is characterized by many spinning strikes. It consists of a quick spinning slice at a short range followed by a right thrust, a slash from left to right, a double slash from right to left, another quick spinning slice, another slash from left to right, and a mid-range double-spin slash with knock-back.
The aerial combo is far simpler than the ground combo. It consists of a double-spin slash, a quick upwards swing, and a quick double-spin slash with knock-back to finish.