I really like the idee of combat durabillity, it adds to tactic and combat mechanics.
The next question would be tho, how would the durabillity work in combat? would you loose 1 durabillity/hit, which would still make durabillity pointless, or would it be that you for example loose like 10% of the weapons durabillity dpeending on how much armor/magic resist the mobs have? it would not make that much of a difference in normal fights, but in tougher fights it would make a bigg difference how you plan your fights. And if a weapon should break during a fight, would it be broken for the rest of the fight or would it just be for a certain amount of rounds? Would it change depending on what difficulty you play? would it also exist spells that could enhance the durabillity for a certain amount of rounds?