Yup yup. So if you're planning on killing the same monster over and over for [possibly?] hours/days, you should be pursuaded to buy OR use a current license of that monster on your weapon.
Even if you're going to just be killing the same monster for like, a single level [Like lv.79's Fire Nix quest as far as I know], if you have the Fire Nix [in this case] license, then you should use it. If you don't have one, you should buy one for cheap.
Added up, it will be very helpful, statistically. :D
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