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Deterioration is a statistic that modifies the efficiency of weapons and armor. When a weapon is used, it deteriorates, and when you wear an armor and you are shot, your armor deteriorates too. When a weapon is deteriorated, the wielder is more likely to suffer a critical failure. (Weapons that stack do not deteriorate.) More deteriorated armor has a higher chance to allow incoming damage to "bypass" it, and a broken armor doesn't block anything.

Slightly worn item

Basic Information

Causing Deterioration

  • Armors deteriorate when person wearing them is hit.
  • Weapon deterioration is caused by shooting with a gun (or punching with a Power Fist, etc.). 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

An item's condition is shown as a percentage, up to 100%, so Deterioration is the inverse; 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. Partially deteriorated armor still has it's full DT and 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 Barter value with NPC Merchants.

Broken Items

Broken weapon

An item that reaches 0% condition (100% Deterioration) is broken, and its description will say "It's beyond repair".

Broken weapons can be held in an active slot and thus brandished, but will no longer function as working weapons for combat purposes.

Broken armors can be worn though they no longer offer any protection, but don't throw them out too quickly! Their bonuses still work; prefix stats are applied even when armor is broken. So armor with +1 Charisma, still gives you +1 to Charisma even once the armor is broken.


You can improve the condition (decrease deterioration) with a successful Repair attempt on a weapon or armor. Use your Repair skill for this, but for best results, arm a repair tool in Slot 1. The Super Tool Kit is the best for this. Low skill will usually result in a failed Repair attempt, which immediately degrades the item's condition (makes deterioration higher).

Condition is shown as a fraction, and all of this above is about the numerator (first percentage) in the fraction, but what about the denominator? 50/100 means the armor is in bad condition at the moment for protecting you against incoming damage, but it's overall condition is brand new, so if you can score a "perfect repair" on it, you might restore it to 100/100 which is as good as it gets. 100/100 is the condition of fresh-crafted armor, which is why many players prefer to craft new gear.

See Also