Proc is an abbreviation that refers to a weapon or item activating with the "Chance on Hit" or "Chance on Use" effect (an ability or a spell).

History Edit

Proc is a common term used in programming to refer to an event triggered under particular circumstances. For example, in WoW, a particular weapon (that hits many times) might have a 10% chance on each hit to apply a special effect, such as poison damage. When WoW users talk about "how often this weapon procs", they are talking about the likelihood of the special effect being processed.

Proc is otherwise sometimes short for "spec_proc" (spec_proc is short for "special procedure") which is a term used by the original programmer of Circle-MUD, Jeremy Elson. It might have been used as well by the original programmers of diku-MUD as well. Special procedures in Circle-MUD are functions that can be assigned to objects, players, and locations in the world such that each time an event occurs, the special procedure function will be invoked. Special procedures were used in Circle-MUD for a wide variety of purposes: Creating room events when a person typed a specific string of text, causing a weapon or piece of armor to perform a magical action, and even causing a MOB (mobile) to do something that it wouldn't normally do.[citation needed] (This may well be the origin of the term.)

Special procedures were a way of creating unique experiences that could not be achieved by simply building the dungeon and populating it with monsters. Special procedures breathed life into these worlds by introducing extra coding that enhanced the gamer's experience without changing the underlying structure or function of the code-base. If you ever played a MUD and were walking around in a dungeon and randomly saw the text "You feel as though you are being watched," that was probably a special procedure.[citation needed]

When developers and players were talking about these special procedures they abbreviated the term to "proc". Over time the noun also became a verb, "proced" ("proc'd" or "procced"), which meant that the special procedure was invoked and performed its action. Most often, players were concerned about their weapons and whether or not the weapon would perform its special attack (a proc), and so proc must have started to take on a narrower meaning for MMORPG players who were somewhat more removed from the core combat engine and flat world of MUDs.[citation needed]

Because this meaning of proc is based on user commands or actions (but always triggered by something the user purposefully does, even though he might not know it) and not on chance, it is different than random procs, such as special random enchantments in WoW like Mongoose.[citation needed]

In World of Warcraft Edit

WoW Icon 16x16 In World of Warcraft, players refer to items that have Chance on Use or Chance on Hit effects as having a proc. Most of the time these items are weapons but they can also be armor, rings, trinkets, and even spell effects. How these items trigger their proc(s) depends upon what kind of an item it is.

Guaranteed effects from critical hits (like "after a critical strike your attack speed is increased by 30% for 15 sec") are called proc too (the effect is automatic, but the critical hit is rare).

Proc Types Edit

  • Chance on hit: (blasts a target for 40 to 56 Fire damage)
    • The active effect has an x% chance to take effect when you successfully attack something with your melee weapon, such as the chance to hurl fireballs at the enemy or to restore mana or health to you. Typically, Druids who are shapeshifted do not receive benefits from melee procs. They can, however, make use of "Chance on Hit" abilities in other slots.
    • Example: [Perdition's Blade]
  • Chance on critical hit: (increase your attack power by 300 for 10 secs)
  • Chance on spell hit: (increase your spirit by 222 for 10 secs)
  • Chance on spell critical hit: (increase your spell power by 225 for 10 secs)
    • Similar to above, except the effect will only become active on successful spell critical hits.
    • Example: [Shiffar's Nexus-Horn]
  • Guaranteed on critical melee hit:[citation needed] (Increases your attack speed by 30% for your next 3 swings after dealing a critical strike)
    • Similar again, but this time the effect requires a critical hit in order to activate. Similar effects also exist for spell critical hits.[citation needed]
  • Equip: (increase attack power by 20)
    • Included here for contrast, "Equip:" effects are not considered "procs," but some of them can provide similar benefits. Further adding to the confusion, a static "Equip:" effect may grant a "Chance on Hit" ability to the wearer, and that granted ability would be considered a proc. For an "Equip:" effect the passive effect, be it increased attack power, increased chance to resist stuns or a chance to return damage to the attacker, will be in effect at all times while this item is equipped and not broken.
    • Example: [Rune of the Guard Captain], [Hand of Justice], [Darkmoon Card: Maelstrom]

Weapons Edit

For weapons that have a proc, they usually have a Chance on Hit to either aid the wielder, harm his target(s) or both. Procs can also be added to weapons by enchanting them with certain enchants. The proc-rate of a weapon is the frequency with which the weapon triggers its proc. This varies depending on the nature of the weapon and how it is wielded. Certain epic weapons have a very high chance of proc'ing (30+%), but most players report that wielding one-handed weapons in your off-hand reduces the proc-rate by 50%.

Many players argue that an item's proc-rate is not dependent upon the weapon's speed, while others insist that procs only trigger when the weapon hits and therefore the proc-rate does depend on weapon speed. In my own experience the latter is true, but it can be difficult to prove.

PPM Edit

It has been proven however that enchantment procs are based on something called Procs per Minute (PpM, PPM, or ppm). This in essence makes slower weapons, especially on a class like a rogue with instant attacks boosting their attacks per minute like crazy, actually proc more than faster weapons.

The PPM system works as follows: The actual chance each hit with a weapon procs the effect is PPM * weapon speed / 60. Dual wielders should note that all instants (including the extra attack granted by Sword Specialization talent from Warriors & Rogues) always happen with the main hand weapon, severely increasing the number of hits per minute with that weapon. (This also explains as to why people find OH weapons proc much less, they just don't hit as much)

Armor, Rings, and Trinkets Edit

Worn items such as these can either trigger their proc when the wearer is hit in combat, when the wearer casts a spell — offensively or defensively, when the wearer uses the item, or when the wearer hits his opponent with a melee attack. That would tend to make the first proc more valuable to players who get hit quite often, in other words PVPers and warriors, the second proc useful to anyone, and the third proc most useful to melee combatants like rogues.

Spell Effects Edit

Some spell effects can also grant players a proc. Examples: The Druid spell Thorns grants the player a proc that damages his attackers when they strike him. The Warlock's Imp spell Fire Shield is similar to Thorns. The Shaman spell Windfury Totem causes each attack to have a chance of permitting a free attack with a bonus to their attack power. Both the Paladin seals Seal of Command and Seal of Righteousness have a chance on hit to cause holy damage (though in very different ways).

See also Edit

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