Proc Coefficient

The proc coefficient is essentially a multiplier of 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.

(Note: Since the 1.0 update, MUL-T's nailgun has a proc coefficient of 0.6 rather than 0.4. The quote is given primarily as rationale for the proc coefficient system.)

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, normally a character would require 10: (10% x 10 = 100%). However, with the reduced proc coefficient they now would require 20: (5% x 20 = 100%).
 * Importantly, this does not apply to critical strike chance from items such as.

Skills and effects with low proc coefficients often hit faster than normal or hit more than one target. Because of this, those skills and effects tend to be more effective at utilizing item effects with linear stacking for their trigger chance (notably Bleed effects) than those with higher coefficients but that hit slower or hit fewer targets. The caveat is, of course, that these skills require a greater investment required to reach their maximum potential. Exceptions also exist; for instance, many of skills hit very quickly but also have very high coefficients.

For more information on item stacking mechanics and strategies, see Item Stacking.

Proc Coefficient Effects
See also: Item Stacking

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

Survivors
A list of all the proc coefficients for each skill, for each survivor.

Items
List of items that have effects that also have a proc coefficient. Notes:
 * Damage-over-time effects, such as and, have a proc coefficient of 0.0 and thus will never activate other effects.