Ancient Blade

are NaN Items in.

Location and Uses
NaN Ancient Blades are NaN Materials. They can be TotK: to a weapon or arrow to increase its attack power by 50, but will break after the first hit, and will disintegrate normal enemies on contact in the same way as NaN Ancient Arrows.

They can be found in various chests across Hyrule, as well as bought from a TotK: in the TotK: once the TotK: sidequest has been completed.