The threat range for a weapon indicates the likelihood of scoring a critical hit with that weapon. For most weapons, this range is 20, but some weapons have threat ranges of 19-20 or 18-20. All attack rolls that fall into the threat range before adding the attack bonus threaten a critical hit if the attack is successful. Such a threat is resolved by a threat roll, which is similar to an attack roll, but without automatic failure and success on natural rolls of 1 and 20, respectively.
|Unmodified threat range||18–20||19–20||20|
|With either keen or improved critical||15–20||17–20||19–20|
|With both keen and improved critical||12–20||15–20||18–20|
|With ki critical||16–20||17–20||18–20|
| With ki critical and|
either keen or improved critical
|With all three||10–20||13–20||16–20|
- Crossbows are ranged weapons, so can benefit from neither ki critical nor the keen property.