Right now, there are only weapons which have a minimum strength requirement.
Why not a minimum agility requirement? Knives and daggers would be a good candidate, but there could also be a heavy weapon which looks like a fancy spear with a blade at both ends.
There could also be certain weapons with a minimum intelligence requirement, perhaps a number of staffs.
These weapons would be powerful, but only available to people who have been training agility or intelligence at the cost of slower progression in other areas.
There could also be weapons with ~maximums~. The idea would be that certain weapons would no be useable by advanced players. They should be rare. Granted through quests then passed down by person to person trades.
Enchanted weapons would also be good. Something that when weilded would give a bonus to a certain skill or attribute. Just make sure that when the weapon is unequipped, the bonus goes away!
Further, others have said this in the past but it needs to be said again: Make it so that when you resell weapons to NPCs, you only get 50% of your money back instead of 80% or whatever it is now. This will force more player to player interaction.
Claymore isn\'t powerful enough right now. Over time, it only deals out 70% the dammage of steel falchions. It deals more in one hit, but is significantly slower. Perhaps you could make it so that the formula for dammage from falchions is more dependant on sword skill, and the formula for dammage from claymore would be more dependant on strength?