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.

A weapon's threat range can be increased through the keen item property and the improved critical and ki critical feats.

heavy flail,
All others
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
13–20 15–20 17–20
With all three 10–20 13–20 16–20


  • Crossbows are ranged weapons, so cannot benefit ki critical.
Community content is available under CC-BY-SA unless otherwise noted.