Proc Coefficient

Proc coefficient is essentially a multiplier of either an item's effect, trigger chance, duration or any combination of the three. Something with a proc coefficient of 0.5 will have half the effect/chance/duration than something with a coefficient of 1.

In Hopoo Games Development Thoughts #1, the developers introduced the concept of proc coefficient like so:


 * "MUL-T’s nailgun has a low proc coefficient per nail of 0.4 compared to most character’s 1.0, so he isn’t proccing stuff a ton faster than other characters." - Quote from NaKyle, 03/30-2019.

Mechanically, a character with skills that have lower proc coefficients will require more items to reach a similar effect than skills with higher coefficients, but those caps for effects with linear stacking can still be reached.

Like in the example above of a skill with a coefficient of 0.5, to reach the maximum chance to bleed using s, normally you would require 7: (15% x 7 = 105%). But now would require 14: (7.5% x 14 = 105%).
 * Importantly this does NOT apply to Critical Strike Chance from items such as.

Since skills and effects with low Proc Coefficients often hit more often/faster and/or more targets, those skills and effects tend to be MORE effective at utilizing item effects with linear stacking (notably Bleed effects) than those with higher coefficients but that hit slower/less targets. The caveat of course being a greater investment required to reach their maximum potential. Exceptions also exist, many of the Commando's skills for example hit very quickly but also have very high coefficients.

For more information on item stacking mechanincs and strategies, see Item_Stacking.

Here is a list of all known proc coefficient values in the game:

Items
DoT effects such as or  can not proc other effects. Notes:

Proc Coefficient Effects
See also: Item Stacking

Items that are affected by proc coefficient and how they are affected: