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The base cost of a mechanical trap is 1,000 gp. Apply all the modifiers from Table: Cost Modifiers for Mechanical Traps for the various features you’ve added to the trap to get the modified base cost.
The final cost is equal to (modified base cost x Challenge Rating) + extra costs. The minimum cost for a mechanical trap is (CR x 100) gp.
After you’ve multiplied the modified base cost by the Challenge Rating, add the price of any alchemical items or poison you incorporated into the trap. If the trap uses one of these elements and has an automatic reset, multiply the poison or alchemical item cost by 20 to provide an adequate supply of doses.
Multiple Traps: If a trap is really two or more connected traps, determine the final cost of each separately, then add those values together. This holds for both multiple dependent and multiple independent traps (see the previous section).
| Table: Cost Modifiers for Mechanical Traps | |
|---|---|
| Feature | Cost Modifier |
| Trigger Type | |
| Location | — |
| Proximity | +1,000 gp |
| Touch | — |
| Touch (attached) | –100 gp |
| Timed | +1,000 gp |
| Reset Type | |
| No reset | –500 gp |
| Repair | –200 gp |
| Manual | — |
| Automatic | +500 gp (or 0 if trap has timed trigger) |
| Bypass Type | |
| Lock | +100 gp (Open Lock DC 30) |
| Hidden switch | +200 gp (Search DC 25) |
| Hidden lock | +300 gp (Open Lock DC 30, Search DC 25) |
| Search DC | |
| 19 or lower | –100 gp x (20 – DC) |
| 20 | — |
| 21 or higher | +200 gp x (DC – 20) |
| Disable Device DC | |
| 19 or lower | –100 gp x (20 – DC) |
| 20 | — |
| 21 or higher | +200 gp x (DC – 20) |
| Reflex Save DC (Pit or Other Save-Dependent Trap) | |
| 19 or lower | –100 gp x (20 – DC) |
| 20 | — |
| 21 or higher | +300 gp x (DC – 20) |
| Attack Bonus (Melee or Ranged Attack Trap) | |
| +9 or lower | –100 gp x (10 – bonus) |
| +10 | — |
| +11 or higher | +200 gp x (bonus – 10) |
| Damage Bonus | |
| High strength rating (ranged attack trap) | +100 gp x bonus (max +4) |
| High Strength bonus (melee attack trap) | +100 gp x bonus (max +8) |
| Miscellaneous Features | |
| Never miss | +1,000 gp |
| Poison | Cost of poison* |
| Alchemical item | Cost of item* |
| * Multiply cost by 20 if trap features automatic reset. | |
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