Occasionally when fighting in melee with a weapon you are Expert in, not twoweaponing, and there is no special artifact effect already in play, you get some special benefit of that weapon type. ( Ideas:

• Some of the longer swords allow parrying monsters’ attacks.
• Mace or flail or morning star could stun or confuse targets
• Stiletto gives you automatic counterattacks sometimes.
• Spears can skewer through an enemy and hit another one directly behind it.

Martial artists should be able to use martial arts weapons to use extra abilities, such as:

• Throwing shuriken is a bonus action that costs no time (at least in some circumstances).
• While wielding a quarterstaff, you can jump.
• While wielding nunchaku, you can disarm opponents.

Artifact flail or short sword, the Debugger. Deals double damage to all a-class, s-class, and x-class monsters.