on rightclick with a 264:
    item is enchanted with protection -1
    loop all pleyer:
        %pleyer% is holding 264
        item is enchanted with protection -1
        damage %entit% by 10 hearts
        message &0&l無駄ァ %pleyer%
        execute console command "/clear @p minecraft:diamond -1 -1 {ench:[{id:0s,lvl:-1s}]}"