Infinity is much more sword-like than most of Xemnas's other ethereal blades. The blade is not unlike that of Triumph or Conquest, as it sports the same concave edges, but Infinity's blade is longer and hollow. The handle is shaped like a cross with a diamond-shaped gap in the center. The handle is connected to a guard of sorts that is an extension of the sides of the blade. This guard has two spikes on either side. Infinity has a very faint yellow glow and is mostly black, though the tip of the blade is red-orange.
When striking a target, Infinity creates an impact effect with a pink ring. When landing a combo finisher, it creates an effect with multiple overlapping rings.
Infinity, better known by the symbol ∞, is a quantity without bound or end. In mathematics, it represents an unbounded value.
The Infinity+'s attack combos have high speed and wide range. The ground combo consists of a single slash from left to right, a double slash from right to left, and a launch of four blades in an upwards arc. A -Combo can be activated after the double slash; instead of throwing the blades in a vertical line, Xemnas throws four blades in a horizontal line.
The Infinity+'s aerial combo consists of a spinning slash, a quick double-spin slash, and a powerful double-spin swing that covers a wide area, dealing a large amount of damage and knocking back enemies.