PRO or Weapon PROC refers to a special effect or ability that is triggered under certain conditions during gameplay. The term "PROC" is believed to be an acronym for "Programmed Random Occurrence". It refers to the random activation of specific weapon abilities or effects.

In Otherside's Legends of the Mara, there are four types of Weapon PROCs that give unique abilities to Koda Weapons: Explosion, Blood Explosion, Cursed Armament, and Venomous Blades.

Weapon PROCs

Explosion

Blood Explosion

Cursed Armament

Venomous Blades