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.

Make Demonbane a mace rather than a long sword, to make it more attractive to Priests.