If you aren't SUPER tight on lambda grinders it might be more efficient to use all those 10* dio weapons that drop in like every EQ instead. While the maximum ammount of exp you get per weapon won't be as high as using 12*s, you'll probably only end up using 2 or 3 more lambda grinders, and it's WAY cheaper.
As nice as Emper Embrace is, the bonus for using the exact same weapon, or even just the same rarity is much higher, and most of the NT Dio weapons drop pre-grinded, increasing the bonus even more.
I actually don't think feeding 12*s with emper embrace to use as fodder is efficient in the first place, specifically because they lack the same weapon/rarity bonus when making fodders.
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