没有直接是17-20的,不过3e有一个间接的
Stump Knife: A stump knife is akin to a punching dagger, except that it can be securely attached to the stump of a missing forelimb. For someone proficient in its use, the stump knife becomes an extension of his body. Against foes to whom you have dealt damage during a continuous melee, the stump knife’s threat range is doubled (17–20). Your opponent cannot disarm you of a stump knife.