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Deterioration is a statistic that modifies weapons and armors efficiency.

Slightly worn item

When they are used, weapons deteriorate, and when you wear an armor and you are shot, your armor deteriorates too! When a weapon is deteriorated, it had more chance to cause critical failure.

Basic Information

Causing deterioration

  • Armors deteriorate when person wearing them is hit.
  • Weapon deterioration is caused by shooting with the weapon. Any weapon that can stack does not deteriorate. This includes all Throwing weapons and most low-tier Unarmed and Melee weapons.


The deterioration formula uses deterioration points, invisible in-game. 1% of deterioration is 300 deterioration points (so 100% would be 30000).

  • Each shot with a weapon gives (300-skill)*(1+brokenCount/3)/2 deterioration points. For example, with 200 in concerned skill, each shot is 50 points for weapon with 0-2 breakdowns, 100 with 3-5, 150 with 6-8, 200 with 9. A weapon that has broken down 9 times will be usable 150 times before it reaches 0% deterioration.

// Actual formula ((max_skill - min(skill, 200)) / 6 200+ skill is equal to 200 there is no difference between 200 and 300

Deterioration Effects

Deterioration is showed in percents, up to 100. The lower number means more deteriorated weapon or armor.

  • The more an armor is deteriorated, the more chance the wearer has a chance to receive "partial bypass" on critical as well as non-critical hits. Chance to be bypassed for each bullet applies when condition goes under 50% and is calculated by formula (50-condition)*2%. (e.g. 0% bypass chance at 50% condition, 50% chance at 25% condition, 100% chance at 0% condition). "Partial bypass" has no effect on traditional critical hit bypass. Deterioration of armor does not change its DT or DR.
  • The more a weapon is deteriorated, the more it has chance to score critical failures when shooting. There is 1% chance per 5% deterioration for a miss to be upgraded to a critical miss : A weapon with 20% deterioration has 16% chance to score a critical miss (Weapon explodes, falls on the ground, etc.) when missing. 95% deterioration means 1 in 100 shots is critical failure (And 1 in 20 is a miss, 1 in 5 is critical miss).
  • The more an item is deteriorated, the less it's worth to sell to NPC traders.

Broken Items

Broken weapon

An item that reaches 0% deterioration is broken.

Broken weapons can not be used.

Broken armors can be worn, but offer no protection. Prefix stats, however, are applied even when armor is broken


You can decrease the deterioration by performing a repair attempt on the weapon. Failing in fixing will make weapon deterioration higher.

See Also