Samurai who twoweapon a katana and wakizashi should get some small bonus to damage or alignment record or similar. Though since they start the game able to do this, it would have to be a small bonus.

New artifact short sword, which is the first sacrifice gift for Rogues. It does extra damage based on the amount of gold carried in your inventory (or possibly your opponent’s inventory, though this would make it no better than a normal short sword on many monsters). The damage bonus eventually runs into diminishing returns so that the damage bonus doesn’t get too ridiculous.

New artifact Mirror Brand. It is an artifact short sword that grants reflection when wielded and when it hits an opponent, takes the higher of its own base damage roll and the other weapon’s (then adds its own enchantment to the result).

It is based on dNetHack, though it’s more akin to a generic mirror blades than the actual Mirror Brand artifact in dNetHack.

New artifact dagger The Barrow-blade of Cardolan: has some flat bonuses, some additional bonuses versus undead, and instakills all W, ghosts, and shades. It is either lawful or unaligned. Could also be a short sword, since there are currently no artifact short swords, but for flavor it should be a dagger.

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

Samurai can wield katanas, wakizashis, and sabers in zero turns.