虽然不是很想发,但既然有人提到RAW和RAI的问题,这里给您来一个终极解决方案
Merciful Combatant (Ex): At 3rd level, an ironbound sword becomes an expert at defeating foes without killing them. An ironbound sword can use any weapon to deal nonlethal damage without taking the normal –4 penalty on attack rolls. Additionally, the ironbound sword gains a +2 bonus on combat maneuvers against a target so long as the last successful attack she made against that target dealt nonlethal damage. Her samurai levels count as fighter levels and stack with fighter levels for the purposes of fighter and samurai prerequisites and class features.
This replaces weapon expertise.
完美的RAW,完美的插件,这才是需要DM爱的东西