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This information is reliable as of patch 2.0.201.56.
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Caves of Qud has a bartering system where items vary in price based on a multitude of factors. Commerce is the base value that is specified for each item that is then multiplied or divided by a multiplier depending on selling or buying.
Trading Multiplier Formula
If the player has Glotrot, Ego modifier and Snake oiler no longer have an effect and returns a flat -3. The equation then becomes
The multiplier cannot be higher than 0.95(achievable with +9 Ego modifier or +7 Ego modifier with Snake Oiler) and the multiplier cannot be lower than .05 (-5 Ego modifier).
When buying an item from a trader, this multiplier is divided by the value of the item in question. When the item is sold, the value is multiplied by the multiplier.
Reputation Effect on Trade Prices
Reputation with the merchant also affects trade prices, acting essentially as a bonus or penalty to the player's ego modifier.
| Reputation with merchant
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Bonus applied to Ego Modifier for Trade
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| 600 or more
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+3 bonus
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| 250 to 599
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+1 bonus
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| -249 to 249
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0
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| -599 to -250
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-1 penalty
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| -600 or less
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-3 penalty
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Sacred Well Reputation Formula
How much reputation the Sacred well gives is also dependent on the commerce value of the object.
Reputation cannot go lower than 1, and if an object that has no specified value defaults to 10 reputation.
Book Experience Formula
Modifications and Commerce
Each modification has a Value attribute that is multiplied against the base Commerce value to get the new modified value.
Items by Commerce Value
| Page | Commerce | Category |
| Page | Commerce | Category |
| Otherpearl | 33,333.0 | Bracelets |
| Kesil Face | 10,000.0 | Masks |
| Hand-E-Nuke | 10,000.0 | Grenades |
| Shemesh Face | 8,000.0 | Masks |
| Circle of light in the chord of Ehalcodon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Agolgot | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Rermadon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Qas | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Bethsaida | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Shugruith | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Qon | 7,500.0 | Floating Nearby |
| Flange from the Great Machine | 6,666.0 | Armor |
| Gauge from the Great Machine | 6,666.0 | Masks |
| Sail from the Great Machine | 6,666.0 | Cloaks |
| Gear from the Great Machine | 6,666.0 | Shields |
| Earth Face | 6,500.0 | Masks |
| Zetachrome lune | 6,000.0 | Armor |
| Levant Face | 5,000.0 | Masks |
| Olive Face | 4,000.0 | Masks |
| Null Face | 4,000.0 | Masks |
| Mecha power core | 4,000.0 | Items |
| Swarm rack | 3,200.0 | Heavy Weapons |
| Timecube | 3,000.0 | Trinkets |
| Mental aggregator | 2,265.0 | Helmets |
| Psychodyne helmet | 2,140.0 | Helmets |
| Transkinetic cuffs | 2,100.0 | Bracelets |
| Phase cannon | 2,000.0 | Heavy Weapons |
| Cathedra with black opal tracery | 2,000.0 | Cybernetics |
| Spaser rifle | 2,000.0 | Rifles |
| Cathedra with white opal tracery | 2,000.0 | Cybernetics |
| Blast cannon | 2,000.0 | Heavy Weapons |
| Cathedra with ruby tracery | 2,000.0 | Cybernetics |
| Fist of the Ape God | 2,000.0 | Cudgels |
| Cathedra with sapphire tracery | 2,000.0 | Cybernetics |
| Flawless crysteel shardmail | 1,900.0 | Armor |
| Leyline puppeteers | 1,750.0 | Gloves |
| Crystalline halo | 1,666.0 | Helmets |
| Black mote | 1,666.0 | Floating Nearby |
| Crystalline jile | 1,666.0 | Short Blades |
| Chassis plate | 1,600.0 | Cloaks |
| Dagasha's spur | 1,500.0 | Hats |
| Kah's loop | 1,500.0 | Armlets |
| Zetachrome pumps | 1,500.0 | Footwear |
| Zetachrome battle axe | 1,500.0 | Axes |
| Spaser pistol | 1,500.0 | Pistols |
| Two-handed zetachrome long sword | 1,500.0 | Long Blades |
| Zetachrome hammer | 1,500.0 | Cudgels |
| Va'am's lens | 1,500.0 | Shields |
| Nacham's ribbon | 1,500.0 | Cloaks |
| Tri-hologram bracelet | 1,500.0 | Bracelets |
| Zetachrome halberd | 1,500.0 | Axes |
| Zetachrome apex | 1,500.0 | Helmets |
| Zetachrome gloves | 1,500.0 | Gloves |
| Light rail | 1,500.0 | Rifles |
| High-energy thermo cask | 1,500.0 | Armor |
| Zetachrome warhammer | 1,500.0 | Cudgels |
| Zetachrome long sword | 1,500.0 | Long Blades |
| 3D cobblers | 1,400.0 | Footwear |
| Zetachrome dagger | 1,390.0 | Short Blades |
| Longreach grappling gun | 1,250.0 | Pistols |
| High-voltage arc winder | 1,250.0 | Pistols |
| Chiral rings | 1,250.0 | Floating Nearby |
| Enigma cone | 1,250.0 | Armor |
| Crysteel shardmail | 1,200.0 | Armor |
| Nullray pistol | 1,200.0 | Pistols |
| Hand rail | 1,050.0 | Pistols |
| Thermo cask | 1,000.0 | Armor |
| Anti-gravity boots | 1,000.0 | Footwear |
| Gas tumbler | 1,000.0 | Equipment |
| Di-thermo beam | 1,000.0 | Pistols |
| Chain laser | 1,000.0 | Heavy Weapons |
| Psychic meridian | 999.0 | Helmets |
| Dazzle cheek | 999.0 | Masks |
| Palladium mesh tabard | 925.0 | Cloaks |
| Helping hands | 900.0 | Backpacks |
| Kaleidocera muffs | 900.0 | Gloves |
| Kaleidocera cape | 900.0 | Cloaks |
| Eigenrifle | 900.0 | Rifles |
| Night-sight interpolators | 900.0 | Eyewear |
| Nano-neuro animator | 900.0 | Tools |
| Kaleidocera krakows | 900.0 | Footwear |
| Psychal fleshgun | 900.0 | Pistols |
| Point-defense drone | 800.0 | Floating Nearby |
| Gyrocopter backpack | 800.0 | Backpacks |
| Nanoweave vest | 795.0 | Armor |
| Laser rifle | 750.0 | Rifles |
| Geomagnetic disc | 750.0 | Thrown Weapons |
| Freeze ray | 750.0 | Rifles |
| Hypertractor | 750.0 | Rifles |
| Space inverter | 750.0 | Pistols |
| Linear cannon | 750.0 | Heavy Weapons |
| Arc winder | 750.0 | Pistols |
| Plastifer chem vest | 750.0 | Armor |
| Flawless crysteel great sword | 720.0 | Long Blades |
| Flawless crysteel warhammer | 720.0 | Cudgels |
| Flawless crysteel battle axe | 720.0 | Axes |
| Flawless crysteel long sword | 720.0 | Long Blades |
| Flawless crysteel mace | 720.0 | Cudgels |
| Flawless crysteel halberd | 720.0 | Axes |
| Precision nanon fingers | 700.0 | Gloves |
More...
