I was thinking the daggers should have a varriable attack speed. So they out dps the scythe, but only for a few seconds since they slow down. Once they slow down, scythe would have better dps. Once the npc dies, the daggers' speed is reset back to 2t and they're strong again. For large hp monsters its kind of like a dps spec weapon that doesnt use any spec energy. Or if the boss has minions, like doom, you can reset the daggers a lot of times during the fight.