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 This skill allows a character to build mechanical devices from scratch, including engines and engine parts, weapons, armor, and other gadgets. When building a mechanical device from scratch, the character describes the kind of device he or she wants to construct; then the Gamemaster decides if the device is simple, moderate, complex, or advanced compared to current technology. 
| 
Type of Scratch-Built Mechanical Device (Examples) | 
Purchase DC | 
Craft DC | 
Time
 |  
| 
Simple (tripwire trap) | 
5 | 
15 | 
1 hr
 |  
| 
Moderate (engine component, light armor) | 
12 | 
20 | 
12 hr.
 |  
| 
Complex (automobile engine, 9mm autoloader handgun) | 
16 | 
25 | 
24 hr.
 |  
| 
Advanced (jet engine) | 
20 | 
30 | 
60 hr.
 |  
 
Special: A character without a mechanical
  tool kit takes a –4 penalty on Craft (mechanical) checks. 
A character with the Builder feat gets a +2 bonus on all Craft (mechanical) checks.  |