Judicator

The Judicator is an ice-based Affinity Weapon that was possibly made for and by the Vhozon. Noxus' weapon of choice, it shoots supercooled plasma at near absolute zero temperatures and ricochet off impacted surfaces. When charged, it fires three shots, unless used by Noxus, in which case it can freeze enemies within a certain radius.

Samus Aran acquires the Judicator in Arcterra. The Judicator is then used to take down the Slench in Arcterra, as well as destroy numerous Purple Force Fields and Purple Blast Shields in Arcterra and Alinos. Additionally, the Judicator is effective against Spire and enemies that use attacks similar to the Magmaul. When used in story mode, it colors the markings on Samus' Arm Cannon purple.

Multiplayer role
The Judicator is good for mid to short range combat. Noxus can freeze people with the charged shot; once he freezes his enemies with the charged shot, he has the chance to plug a few rounds into them, or use the Imperialist for an instant kill headshot. Noxus's charged shot has a short range, though, so he must stay close to his target. However, there is a glitch called Shadow Freezing to bypass that. If it is not Noxus using the Judicator, then a charge shot, instead of freezing an opponent, will shoot three rounds at once. A common strategy is to be close to the target so the all of the rounds hit it.

Trivia

 * Plasma is the 4th state of matter, beyond gas. It is found in stars, lightning, plasma televisions, and other things. While typically very hot, it is possible to make plasma at temperatures as low as 0.1 Kelvin (which is, indeed, close to absolute zero) by using a laser cooling system.
 * Certain objects will show the words "SUPERCOOLED PLASMA" in the description when scanned. The words "SUPERCOOLED PLASMA" always refer to the Judicator.
 * When charged shots are fired by hunters other than Noxus in multiplayer, the Judicator shoots out 3 rounds simultaneously similar to the mechanics of the Spazer Beam. When charged shots are fired by Noxus, they have an ability to freeze similar to the Ice Beam.
 * Besides the Magmaul, the Judicator is the only weapon that Samus has used that can bounce off of walls.