Durability
Durability
Durability is the wear-and-tear item property found on every weapon, shield, piece of armor, imbued or replica item, and select special artifacts (such as the Mana Phasing Orb talisman). It encodes how close an item is to breaking versus how much repair headroom the item has remaining. Durability is displayed as two integers separated by a slash: current durability / maximum durability, both in the range 0–255. When both values reach 0 simultaneously, the item is destroyed. Durability is the canonical gear-economy lever in UO — every fight, every cast, every server-cross slowly wears down a suit, and the post-craft enhancement chain (Powder of Fortifying, repair contracts, Self Repair property) is the maintenance ecosystem that keeps a high-end suit alive over thousands of hours of play.
The Durability display
Items show Durability as Current / Maximum:
| Display | Reading |
|---|---|
Durability 50 / 100 |
Current = 50, Maximum = 100 — the item has 50 hits/repairs of usability remaining and a max ceiling of 100 |
Durability 0 / 100 |
Current = 0, Maximum = 100 — item is at zero current; the next damage tick reduces Maximum by 1 |
Durability 0 / 1 |
Current = 0, Maximum = 1 — the next damage tick destroys the item |
The two values interact: current can be repaired up to maximum; maximum can only be raised by Powder of Fortifying. When current hits 0 and the item continues to be used, maximum is decremented instead of current — this is the slow-irreversible-death mechanic.
Decreasing Current Durability
Current Durability decreases through:
| Source | Effect |
|---|---|
| Hitting a target (melee/ranged weapons) | -1 per swing chance |
| Being hit by a target (armor, shields) | -1 per hit chance |
| Slimes / Acid Elementals (increased rate) | The two creature types have an explicit acid-corrosion mechanic that wears items at an accelerated rate |
| Spell damage (most spells do not affect armor) | Negligible |
The lowest current durability is 0.
Increasing Current Durability — repair
Current durability is restored by repair, using the appropriate craft skill or a corresponding Repair Contract:
| Craft skill | Repairs |
|---|---|
| Blacksmithy | All metal armor, metal shields, metal weapons |
| Bowcraft & Fletching | All bows |
| Carpentry | Woodland Armor, Bokutos, Wooden Shields |
| Masonry (Carpentry sub) | Stone armor, stone shields, stone weapons |
| Glassblowing (Alchemy sub) | Glass Swords and Glass Staves |
| Tailoring | All leather armor and hats |
| Tinkering | Imbued or replica jewelry, Gargish Necklaces, Earrings |
A Repair Contract is a one-shot purchasable consumable that replicates a craft-skill repair without needing the underlying skill — useful for pure non-crafters or for emergency field repairs.
The maximum current durability cap is 255 — items capped at maximum can be Self-Repair-restored above 100 only up to 255.
Self Repair (item property)
The Self Repair property restores a small amount of current durability during combat automatically — no skill or contract required. Self Repair is found on certain artifact and reforged items. Self Repair is removed when an item is imbued — the player loses the property as part of the trade for adding 5 custom mods. The build choice between "keep Self Repair" or "imbue 5 mods" is one of the core suit-building decisions.
Decreasing Maximum Durability
Maximum durability decreases through two slow-decay mechanisms:
| Mechanism | Effect |
|---|---|
| Continued use at Current 0 | When current is 0 and the item takes another tick of damage, maximum is decremented by 1 instead of current |
| Repair failure | There is a chance during repair that maximum is decreased by 1 (per the Five on Friday — November 16, 2007 reference; the chance scales with the inverse of the repair-skill value, on a "Test Center" 1000-point scale) |
The lowest maximum durability is 0 — when reached, the item is destroyed. This is the irreversible permanent destruction case.
A typical item life cycle:
| Stage | State |
|---|---|
| Crafted | 100/100 (or 36-48 baseline for some craft tiers) |
| Combat-worn | 60/100, repair to 100/100 — some chance of dropping to 100/99 over many repair cycles |
| End-of-life | 0/30 — player decides to retire item; one more hit destroys it |
| Powder-of-Fortifying-extended | 200/200 → eventually 0/255 (the ceiling) |
Increasing Maximum Durability — Powder of Fortifying
Powder of Fortifying is the canonical max-durability extension consumable:
| Mechanic | Detail |
|---|---|
| Effect | +10 to current and maximum durability per charge |
| Maximum durability ceiling | 255 |
| Restriction | Cannot be applied to imbued items — apply Powder before Imbuing |
| Source | Crafted via Tinkering / Smith trade-skills, also available from various event/turn-in vendors |
A typical "save the suit" workflow: craft a 100-max-durability item, apply 15 charges of Powder = +150 max = 250 max (effectively 255 capped), then imbue. The item is now permanently locked at the high durability ceiling.
Items with Durability above 255
A small population of items have Current and Maximum Durability above 255. These fall into two categories:
| Source | Mechanic |
|---|---|
| Event Moderator-created items | Hardcoded durability above 255 — designed for prestige-tier items not subject to normal wear |
| Bug-created items (duping, etc.) | Various exploits historically created over-cap durability values |
Over-255-durability items can be repaired up to their Maximum but it is assumed that Powder of Fortifying cannot be applied to them to push the cap further.
Legacy "Durability" property (pre-AoS)
A historical pre-AoS magic-item system used Durability titles (Durable, Substantial, Massive, Fortified, Indestructible) accessed via Item Identification. When AoS rolled out, those titles were converted into a single new property called "Durability" with a value of 10–100% representing a percentage maximum-durability boost.
| Era | Pre-AoS title | AoS-era equivalent |
|---|---|---|
| Pre-AoS | Durable | "Durability" property +10% |
| Pre-AoS | Substantial | +25% |
| Pre-AoS | Massive | +50% |
| Pre-AoS | Fortified | +75% |
| Pre-AoS | Indestructible | +100% |
Important — this old "Durability" property is distinct from the actual Durability X/Y stat on a modern item. The actual Durability appears as the last property on an item; the legacy "Durability" appears as one of the first properties. Both can coexist on a single legacy item.
The legacy Durability property was rendered largely obsolete by Powder of Fortifying — Powder can extend Maximum Durability indefinitely (up to 255), making the +10–100% boost from the old property less meaningful than it was in the pre-Powder era. Many legacy "Indestructible" items still circulate, but their value is more nostalgic / collector-driven than mechanical.
It has been theorized that items have always used the "Durability X/X" format internally — only the AoS conversion exposed the underlying mechanic to display.
Imbuing Durability
| Property | Max imbued intensity | Resources for the highest tier |
|---|---|---|
| Durability (Imbuing slot) | +100% Maximum Durability | 5 Enchanted Essence + 10 Diamond + 10 Powdered Iron |
Imbuing Durability counts as one of the 5 Imbue slots. Whether to spend a slot on Durability or on a damage/utility mod is a build trade-off — Powder of Fortifying often achieves a similar Max-Durability outcome without consuming an Imbue slot, so Durability imbuing is rarely the optimal choice for serious builds.
Suit-care best practices
| Practice | Why |
|---|---|
| Always Powder before Imbuing | Powder is locked out post-imbue |
| Avoid Slimes / Acid Elementals if you value the suit | Both cause accelerated durability decay |
| Carry repair contracts in field | Repair-Contract repair has the same mechanics as skill-repair |
| Recognize the 0/X warning state | Once Current hits 0 and Max starts decreasing, the item is on the path to destruction |
| Decide Self Repair vs Imbue early | Self Repair is lost on Imbuing; commit to one path |
See also
- Powder of Fortifying — the +10/+10 max-durability consumable
- Imbuing — locks out Powder; consumes Self Repair
- Crafting — the production / repair skills overview
- Item Properties — the broader item-property reference
- Ultima Online: Age of Shadows — the expansion that converted legacy Durability into the modern X/Y system
- Item Identification — the pre-AoS skill that displayed the Durable/Substantial/Massive/Fortified/Indestructible legacy titles