Nanites

The nanite is an item sold by the Cyborg.

It is used solely for crafting nano-related items, whose purpose is to inflict the Confused debuff with Ranged or Melee Weapons.

Confused enemies will walk in the wrong direction for 2 seconds, giving the player some "breathing room", but only if the enemy is not immune to the status effect. (Many non-walking enemies are immune to the debuff.)

Trivia
Nanites, nanomachines, and other similar terms refer to nanotechnology, the ability to make microscopic robots that could hypothetically fit into the human bloodstream and apply medication or to be used in constructing extremely fine machinery. They are infamous in Science Fiction circles for being "the new radioactivity", capable of performing physically impossible things, and generally being a replacement for magic in extremely soft Science Fiction. Examples include Generator Rex, Kiddy Grade, Prey, Xenogears, or System Shock 2.